The Image Editor Tab/de
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Die Registerkarte Bildeditor
Die Registerkarte Editor ist der Ort in RawTherapee, wo du deine einzelnen Bilder bearbeitest. Standardmäßig ist RawTherapee im Einreiter-Modus mit vertikalen Registerkartenfahnen voreingestellt. Die Fahnen sind das, wo du eine Registerkarte in den Vordergrund holen kannst. Diese Einstellung ist speichereffizient und lässt es zu, den Filmstreifen' (s. unten) zu verwenden. In den Einstellungen kannst Du auch die Ansicht Multi-Reitermodus auswählen. Das ist auch praktisch. Benötigt aber mehr RAM in Abhängigkeit von der Bildgröße und der Filmstreifen ist nicht nutzbar. Wir empfehlen, sich bei der Einarbeitung erst mal auf den Einreiter-Modus entsprechend der Standardeinstellung festzulegen.
Der Vorschaubereich
Der zentrale Bereich auf dem Bildschirm ist der Vorschau deines Bildes vorbehalten. Dieses Vorschaubild wird aus dem Raw-Bild (oder dem Ursprungsbild in einem alternativen Format) entsprechend der aktuellen Einstellungen der Werkzeuge berechnet. Wenn Du ein Bild lädst und es bereits ein Sidecar-File besitzt wird dieses ebenfalls geladen, die Werkzeuge entsprechend eingestellt und dementsprechend der Zustand bei der letzten Speicherung angezeigt. Wenn Du ein Raw-Foto erstmalig wählst, wird ein Profil angewendet, dass Du unter "Einstellungen > Bildbearbeitung > Standard-Bildbearbeitungsparameter > Für Raw-Dateien" einstellen kannst. Wer möglichst keine Voreinstellungen haben will, wählt dort in den Einstellungen das aus, was für Nicht-Raw-Bilder ("Bilddateien") vorgegeben ist: (Neutral). Oder wähle eins der mitgelieferten Profile.
Beachte: Die Effekte einiger Werkzeuge sind nur in der 1:1 (100%) Darstellung (und darüber) richtig sichtbar. Diese Werkzeuge werden grundsätzlich in der Zeile der Werkzeugüberschrift ganz rechts aussen mit 1:1 markiert. So sieht das aus: File:Zoom-100-identifier.png. Unscheinbar, aber wichtig.
Das Bild, dass du in der Vorschau siehst wird dem Farbraum des Arbeitsprofils entnommen und in das Monitorprofil umgewandelt, falls ein Monitorprofil geladen ist. Andernfalls in sRGB, was in der Regel in so einem Fall auch richtig ist. Es berücksichtigt hingegen nicht die Ausgabeprofil-Einstellung des Werkzeugs Farbmanagement.
Heh! Mein Raw-Bild sieht anders aus als das Kamera-JPEG
Wenn Du erstmals ein Raw-Foto im Editor öffnest, wirst du dich vielleicht heftig wundern, dass es sehr viel schlechter als das Kamera-JPEG oder das Vorschaubild aussieht. Möglicherweise auch im Vergleich mit anderer Software, mit der Du gerade RawTherapee vergleichst, sieht Dein Raw bei RawTherapee ganz schlimm aus. Was ist hier passiert? Ist RawTherapee kaputt, verrückt oder dein Bild hinüber?
Nichts dergleichen. Solange Du kein spezielles Profil für unbearbeitete Raw-Fotos in den Einstellungen zur Anwendung mit erstmals geöffneten Raw-Fotos voreingestellt hast (was nicht wirklich sein muss), dann muss das Raw so aussehen. Ein Raw ist wie ein unbearbeitetes Negativ analoger Filme. Dem fehlen einfach ein paar Prozessschritte, die die Kamera in ihrem JPEG bereits erledigt hat. Und da dieses Kamera-JPEG auch in geringer Auflösung in dein Raw-File eingebettet wird, sieht auch das Vorschaubild ganz anders (häufig im ersten Moment sogar besser) aus.
3 Dinge, die du in diesem Zusammenhang wissen solltest:
- Deine Kamera zeigt Dir nie die Originaldaten, wie sie der Sensor tatsächlich sieht. Die rohen (raw) Daten des Sensors werden zwar nach wenigen grundsätzlichen Schritten (z.B. Zeilenrauschfilterung) in das Raw-File geschrieben, die Kamera verarbeitet das Bild aber weiter bis zu dem Punkt, wo sie es als JPEG abspeichern würde. In Raw-Dateien speichert sie es auch ab. Allerdings meist mit verringerter Auflösung. Nur zum Zwecke der Vorschau. Aber nicht selten mit der ganzen Vorverarbeitung, die sie auch dem voll aufgelöstem Kamera-JPEG zugesteht. Auch die Bildvorschau und das Histogramm, was die Kamera anzeigt, resultieren normalerweise aus allen Prozessschritten bis zur Abspeicherung des Kamera-JPEGs. Das ist auch gut so. Bei der Aufnahme willst Du ja tatsächlich sehen, was Du mit dem Bild anfangen kannst. Würdest Du nur die Rohdaten sehen, wärst Du vielleicht mit den meisten Bildern unzufrieden bzw. würdest daraufhin Kameraeinstellungen wählen, die ungeeignet sind. Selbst wenn Du alle Kameraeinstellungen so wählst, dass du hoffst, die Kamera würde ihrerseits nichts dazuinterpretieren, entspricht das, was dir die Kamera zeigt bei weitem nicht dem, was im Raw steckt. Die Ingenieure der Kamerahersteller verwenden sehr viel Grips, um aus dem Raw, dem reinen Sensorabbild, mittels einer Reihe von Prozessschritten ein gutes Foto zu entwickeln. Tonwertkurven, Sättigungskorrektur, Schärfen, Rauschunterdrückung... Aber auch Objektivkorrektur für Objektive des Kameraherstellers und ganz viele weitere Dinge werden in die Bildverarbeitung der Kamera eingebaut. Teilweise werden Belichtungsreihen aufgenommen oder bei modernsten Sensoren auch Informationen gewonnen, die eine gewisse HDR-Verarbeitung zulassen. Wir brauchen hier gar nicht noch weiter in die Details zu gehen: Das, was die Kamera zeigt und ins JPEG speichert ist erheblich vorverarbeitet. Im RAW-File hingegen stehen nur Sensordaten mit den geringsten Vorverarbeitungen, wenn überhaupt (zumindest das Zeilenrauschen wird bestmöglich entfernt, weil der Sensor dafür spezielle Pixel im Randbereich hat). - RawTherapee zeigt nun das noch unbearbeitete Raw-Foto. Aber kein Problem. All die kamera-automatischen Bildanpassungen können wir mit RawTherapee in einer viel höheren Qualität nachholen und noch weiter verbessern.
- Jedes Raw-File enthält ein vorverarbeitetes JPEG der Kamera. Normalerweise ist es aus Platzgründen deutlich in der Auflösung verkleinert. Es gibt aber auch Kameras, wo voll aufgelöste JPEGs dabei sind oder JPEGs in mehreren Auflösungsstufen. Wenn du so ein Raw-File in einer anderen Software öffnest, kann es durchaus sein, dass sie dir gar nicht das Raw-Bild, sondern eins der JPEGs anzeigen. Bei den bekannten Bildwerkzeugen IrfanView und XnView ist das so. Aber auch bei Gwenview, Geegie, Eye, F-Spot, Shotwell und gThumb. Das ist auch kein Wunder: Diese Programme sind nicht dazu gedacht ein Raw zu einem fertigen Bild zu entwickeln. - Achtung: Falls Du im Aufnahmemodus mit der Einstellung "Raw+JPEG" fotografierst, muss das im Raw eingebettete JPEG nicht das Gleiche sein, wie das separat abgespeicherte JPEG. Um das Raw klein zu halten kann das darin eingebettete JPEG durchaus mit höherer Komprimierung, also geringerer Qualität enthalten sein. Oder die Entwickler haben sich etwas anderes Sinnvolles gedacht. Das eingebettete JPEG soll immer nur eine Hilfe sein, z.B. bei der Vorauswahl. Nie das vollwertig entwickelte Bild. - Falls Du für ein möglicherweise vereinfachtest Publishing über Nacht in soziale Medien ein Kamera-JPEG verwenden willst, um aber parallel dazu mit mehr Zeit auch noch richtig entwickelte Fotos mittels Raw zu machen, dann wähle unbedingt die Methode "Raw+JPEG" in der Kamera. Die im Raw eingebetteten JPEGs sind nicht uneingeschränkt für die weitere Nutzung gedacht. Auch, wenn das, wie oben beschrieben, zuerst den Anschein macht.
- Die meisten Raw-Entwickler-Programe, also Programme, die tatsächlich die Raw-Daten einlesen und verarbeiten, führen schon mit dem Einlesen einige grundsätzliche Bearbeitungsschritte aus. In diesem Programmen siehst du auch am Anfang nie das tatsächliche, unbearbeitete Raw-Bild. Adobe Lightroom ist so ein Beispiel. Vergleichst Du nun das bei RawTherapee neutral eingelesene Bild mit einem dieser Programme, darfst Du Dich nicht wundern, wenn Unterschiede zu sehen sind. Das, was wir verhindern wollen, dass die Kamera schon unter irgend welchen Annahmen Vorverareitungsschritte ausführt, machen diese Programm im Nachhinein schon beim Einlesen.
Das scheint auf den ersten Blick ein Vorteil zu sein. Da wir aber sowieso alle Parameter in die Hand nehmen wollen und diese anfänglichen Anpassungen keine schwarze Kunst ist, sondern von uns auch mit wenigen Klicks zu erreichen ist, ist diese Automatik eher ein Nachteil. Für den Softwarehersteller ist es aber ein Vorteil: Er kann Newbies leichter zum Kauf überzeugen, weil es scheinbar einfacher ist, mit dem kostenpflichtigen oder gemieteten Programm zum Ziel zu kommen. Was der Hersteller nicht verrät: Es gehört immer eine Lernkurve dazu, tatsächlich gute Fotos zu präsentieren. Und die kleinen Automatiken sind für das Verständnis der Methoden eher kontraproduktiv.
RawTherapee, on the other hand, is designed to show you the real raw image in the main preview, leaving the way you want this data processed up to you. When you use the "Neutral" processing profile you will see the demosaiced image with camera white balance in your working color space with no other modifications. You can even see the non-demosaiced image by setting the demosaicing option to "None". To provide you with a more aesthetically pleasing starting point, we do ship a collection of processing profiles with RawTherapee. After installing RawTherapee, the default profile for processing raw photos is eponymously called "Default". We also ship the "Default ISO Medium" and "Default ISO High" profiles which are designed to give a good starting point to moderately noisy and very noisy images, respectively.
None of the shipped profiles (at least none of the ones shipped in RawTherapee 5.0) are designed to imitate your camera's look. Why not? Every camera is different. My camera's image quality at ISO1600 could be far noisier than your camera's. My camera's response to colors differs from yours. Even the same camera can behave differently at various settings. To provide such profiles, we would need access to raw files for every supported camera model, often multiple raw files in various shooting modes for a single camera, and countless person-hours. This may be possible as a community effort, but it is not a job for a small team. Even then, of what purpose would RawTherapee be if you ended up with a camera JPEG look?
It is far more reasonable that you learn how to use the powerful tools that RawTherapee provides to get the most out of your raws, to surpass the camera look.
As of September 2015 we are starting to ship DCP input profiles made using DCamProf which include an optional tone curve. This curve is modeled after Adobe Camera Raw's default film curve and renders a result similar to your "camera look". The reason we include the curve in new DCP profiles is because it makes for a good vibrant starting point (as opposed to the flat look of using the "Neutral" processing profile) without having to use Auto Levels and without having to touch any of the other tools, and it is entirely optional. Do read the article on input profiles. If we ship a DCP for your camera model which includes the tone curve, the "Tone curve" checkbox in Color Management > Input Profile > DCP will be clickable. Applying the (Neutral) processing profile will disable the tone curve. While the input color profile is applied at the first stages of the toolchain pipeline, the DCP tone curve is applied later in the pipeline at some point after the Exposure tool.
You can create a processing profile ideally tailored to your camera and lens combination, and set RawTherapee to use it by default on your raw photos. See the Creating processing profiles for general use article to learn how.
Preview Modes
In addition to the normal preview, RawTherapee supports a number of other preview modes to help you tweak your photos. Preview modes are controlled via buttons in the Editor toolbar or via keyboard shortcuts. Only one preview mode can be engaged at a time.
| Preview Mode | Shortcut | Button |
|---|---|---|
| Regular* | 
| |
| Red channel | r | 
|
| Green channel | g | 
|
| Blue channel | b | 
|
| Luminance channel | v | 
|
| Focus Mask | Shift+f | 
|
The following preview modes are currently supported:
- Red channel,
- Green channel,
- Blue channel,
- Luminosity, which is calculated as 0.299*R + 0.587*G + 0.114*B,
- Focus mask, to see which areas are in focus
- Preview modes
Regular
Red
Green
Blue
Luminosity
Focus Mask
Red, Green, Blue and Luminosity Preview Modes
When clipping indicators are engaged in the RGBL preview modes, shadow clipped areas are indicated in a blue color and highlight clipping is indicated in red. As during normal preview, the lightness of the clipping highlight is indicative of the degree of clipping.
Preview of individual channels may be helpful when editing RGB curves, planning black/white conversion using the channel mixer, evaluating image noise, etc. Luminosity preview is helpful to instantly view the image in black and white without altering development parameters, to see which channel might be clipping or for aesthetic reasons.
Focus Mask
The focus mask is designed to highlight areas of the image which are in focus. Naturally, focused areas are sharper, so the sharp areas are being highlighted. The focus mask is more accurate on images with a shallow depth of field, low noise and at higher zoom levels.To improve detection accuracy for noisy images evaluate at smaller zoom, around the 10-30% range. Note that the preview is rendered more slowly when the focus mask is enabled.
The current implementation analyzes the preview image which is rescaled from the original captured size. This process of rescaling reduces the noise and is helpful to identify truly sharper details rather than noise itself which may also contain micro texture. At the same time, rescaling of the original image to the preview size compresses larger scale details into a smaller size, and it may introduce aliasing artifacts, both of which could lead to false positives. You can increase your confidence by viewing the mask at various zoom levels. It is not always fault proof, but can be helpful in many cases.
Warning: Be sure to double-check your images if you decide to delete them based on the focus mask.
Background color of the preview
The background color of the preview panel surrounding the image area may be changed to ease image preview during editing and to better visualize image cropping. A vertical stack of three thin buttons in the preview modes toolbar above the image preview panel allows to set the background color of the area around the photo preview.
| Preview Background |
Shortcut | Button | Preview Background and Crop Visualization |
Description |
|---|---|---|---|---|
| Theme-based | 8 | File:Previewback 7 theme.png |  |
The cropped area of the image is masked with a theme-based color. The cropped area visibility is based on the crop mask color and transparency as set in "Preferences > Default Theme > Crop mask color/transparency". |
| Black | 9 | File:Previewback 8 black.png |  |
The cropped area of the image is masked with black. |
| White | 0 | File:Previewback 9 white.png |  |
The cropped area of the image is masked with white. |
Detail Window
The "New detail window" button 
, situated below the main preview next to the zoom buttons, opens a new viewport over the main preview of an adjustable size and of adjustable zoom. This lets you work on the photo zoomed-to-fit while examining several areas of interest at a 100% zoom (or even more). The benefit of using this feature is particularly important to users with slower machines, though not only them, as the zoomed-out main preview takes a shorter amount of time to update than if you were to zoom it to 100% because working at a zoom level less than 100% excludes certain slow tools, such as Noise Reduction, while the little detail windows zoomed to 100% do include all tools and are fast to update because of their small size. This allows you can use the main preview for your general exposure tweaks where it is necessary to see the whole image, and one or more detail windows to get sharpening and/or noise reduction just right.
Preview refresh delay
Changing any tool's parameters sends a signal for the preview image to be updated accordingly. Imagine what would happen if there was no "delay period", and you dragged, for example, the exposure slider from 0.00 to +0.60. A signal would be sent to update the preview for every single change of that value - for +0.01, +0.02, ... +0.59, +0.60. Updating the preview 60 times would be completely unnecessary and actually take longer than it takes you to move the slider. This is especially true for more complicated tools, such as noise reduction, where a preview update can take even a second (depending on your CPU and preview size). The solution is to introduce a very short delay during which parameter changes are ignored, and the signal to update the preview is sent only after no parameter change has been registered after this time.
We have introduced two such paramters:
- AdjusterMinDelay
- Default value = 100ms.
- This is the minimum time to wait before the preview is refreshed.
- AdjusterMaxDelay
- Default value = 200ms.
- This is the maximum time to wait before the preview is refreshed. If you keep changing a parameter, RawTherapee will not wait longer than this short time period before triggering a preview refresh. While the minimum delay is there to prevent overloading your CPU with unnecessary preview refreshes, this delay is to guarantee that you can see what happens to the image as you slowly change some parameter.
You can adjust both of these values in the options file in the config folder.
The Left Panel
To the left is a panel which optionally shows the main histogram ("Preferences > General > Layout > Histogram in left panel"), and always shows the Navigator, History and Snapshots.
You can hide this panel using the 
hide icon, or its keyboard shortcut.
Main Histogram
The main histogram can show the histograms of the red File:HistRed.png, green File:HistGreen.png, blue File:HistBlue.png, CIELab Luminance File:HistValue.png and Chromaticity File:HistChro.png channels of the photo as it would look if you saved it. Use this information to prevent clipping in your end result. If the raw image has no clipping but the end result does, you can easily identify the channel(s) that need adjusting and take the needed steps to prevent it, if it is undesirable.
It can show you the histogram of the raw data File:HistRaw.png before any transformations such as demosaicing are applied to it. Use this information to see whether there is any clipping in the raw image. Clipped raw data cannot be recovered. Some clipped highlights can be reconstructed using the Color Propagation method.
When there is a disproportionately bright area relative to the rest of the image, this will show up as a spike in the histogram. If you want to show this on a linear histogram, unscaled in the y-axis, you will sacrifice seeing the low levels in order to fully show the spike. You can toggle scaling of the histogram in the y-axis 
to help deal with this, then high values will be scaled down so that you may better see the rest of the histogram.
You can show or hide the RGB Indicator Bar File:HistBar.png, which is situated under the histogram and shows you the exact place on the histogram of the R, G, B or L values of the pixel your cursor is currently hovering over in the main preview.
The histogram can be moved to the left/right panel from "Preferences > General > Layout > Histogram in left panel".
The values the main histogram and Navigator panel shows are either those of the working profile, or of the gamma-corrected output profile. You can choose which you prefer in "Preferences > General > Use working profile for main histogram and Navigator".
The Navigator panel shows a thumbnail of the currently opened image, and RGB, HSV and Lab values of the pixel your cursor is currently hovering over.
The values the main histogram and Navigator panel shows are either those of the working profile, or of the gamma-corrected output profile. You can choose which you prefer in "Preferences > General > Use working profile for main histogram and Navigator".
By clicking on the values in the Navigator you can cycle between these three formats:
- [0-255]
- [0-1]
- [%]
RawTherapee 5.1 (and current development versions of the "pixelshift" branch) can show the real raw photosite values. To see them, set the Navigator to use the [0-255] range, apply the Neutral processing profile, then set the Demosaicing method to "None". The Navigator will show the real raw photosite values after black level subtraction within the range of the original raw data.
Historie
Under the Navigator it is the History panel. While editing a photo, all your actions are recorded in this History panel. By clicking on the different entries, you can step back and forth through the different stages of your work.
Schnappschüsse
Under the History panel is a panel called Snapshots. Its use is in that you can save a snapshot of the photo with all the adjustments up to that point in time, and then proceed to further modify your photo to give it a different appearance, saving new snapshots at every moment you feel you might have reached a version of your photo worth saving. Once you have two or more snapshots, you can just click on them to flip through the different versions and stick with whichever one you like best. In the future, the snapshots will be saved to the PP3 sidecar file. For now, the history and snapshots are lost when you load a new photo in the Image Editor or close RawTherapee.
The Right Panel
To the right is a panel which optionally shows the main histogram and Processing Profiles selector ("Preferences > General > Layout > Histogram in left panel"), and always shows the Toolbox.
You can hide this panel using the 
hide icon, or its keyboard shortcut.
Processing Profile Selector
The Processing Profiles drop-down list lets you apply bundled or custom processing profiles. See the File Paths article for information on where these processing profiles reside on your system.
Pay attention to the "Processing profile fill mode" button!
- "Fill" mode
- When the button is activated and you open a partial profile, the missing values will be replaced with RawTherapee's hard-coded default values.
- For instance if you apply a partial profile which contains only sharpening settings, all of the remaining tools (such as Exposure, Tone Mapping, Noise Reduction, Resize, etc) will pop into their default positions.
- "Preserve" mode
- If the button is deactivated and you open a partial profile, only those values in the profile will be applied, and the missing ones remain unchanged.
- For instance if you apply a partial profile which contains only sharpening settings, only those sharpening settings will be applied, and your other tools remain unchanged.
The state of this button will make no difference if you apply a full profile, but most of the profiles bundled with RawTherapee are partial (for good reason).
Toolbox
The Toolbox, in the right panel, contains all the tools you use to tweak your photos. Each tool has its own RawPedia article.
Editor Tab Modes
RawTherapee allows you to work on photos in two modes:
- Single Editor Tab Mode (SETM), where you work only on one photo at a time, and each photo is opened in the same Editor tab. There is a horizontal panel called the Filmstrip at the top of the Editor tab showing the rest of the photos in that folder for easy access. There are Previous Image and Next Image
buttons in the bottom toolbar (and keyboard shortcuts for them) to switch to the previous/next image. - Multiple Editor Tabs Mode (METM), where each photo is opened in its own Editor tab. The Filmstrip is hidden in this mode and there are no previous/next buttons. Having multiple photos opened at the same time requires more RAM.
Try both modes and see which one suits you best. To do that, click on the Preferences icon Preferences icon in the bottom-left or top-right corner of the RT window, choose "General > Layout" and set Editor Layout to your preferred choice.
Use this Preferences window to select a different language for the user interface, to choose a different color theme, change the font size, etc.
It is also possible to start RawTherapee in no-File-Browser-mode (without the File Browser tab) by specifying RawTherapee to open an image from your operating system's file browser (in other words, right-click on a photo and select "Open With > RawTherapee"), or by using the image filename as an argument when starting RawTherapee from the command line (rawtherapee /path/to/some/photo.raw). This mode was introduced for people with little RAM as not having a File Browser tab means RawTherapee uses a little less memory, however in practice the amount of memory saved is little and the usability cost outweighs the little benefit, so it is likely to be removed in the future (see issue 2254).
Der Filmstreifen
If you use Single Editor Tab Mode ("Preferences > General > Layout") you can display a horizontal panel above the preview, this is called the Filmstrip. It contains thumbnails of all images in the currently opened album, and is synchronized with the currently opened image so that you can use keyboard shortcuts or the previous 
and next 
image buttons to open the previous/next image without needing to go back to the File Browser tab.
As of RawTherapee version 4.2.10, you can hide the Filmstrip's toolbar to save screen space. There are two ways of doing this: one way just toggles the toolbar on/off without resizing the filmstrip to the new height, and the other way does the same but also automatically resizes the filmstrip's height. Both are invoked via keyboard shortcuts only. As resizing the filmstrip's height will trigger a refresh of the image preview and this might take a while if using CPU-hungry tools like noise reduction while zoomed in at 100%, the mode that doesn't resize has been implemented for users with slow machines. Users with fast machines will find the auto-resizing mode more helpful.
Monitor Profile and Soft-Proofing
The widgets under the main preview in RawTherapee 5 allow you to apply a monitor color profile to the preview image. This enables users who have calibrated and profiled their monitors to get an instant and accurate preview of their work, whether you're staying in sRGB or working in a wide gamut. Note: OS X users are limited to sRGB and will not get an accurate preview otherwise (see discussion), while users of Linux and Windows will get a correct wide-gamut preview.
Go to Preferences > Color Management and point the "Directory containing color profiles" to the folder into which you saved your monitor and printer ICC profile. Restart RawTherapee for the changes to take effect. Now you will be able to select your monitor's color profile in the combo-box under the preview. Use the "Relative Colorimetric" rendering intent unless you have a good reason otherwise.
One can also enable soft-proofing of the preview. This will show you what your image will look like once it gets transformed by the printer profile set in Preferences > Color Management. If you want to adjust an image for printing and you have an ICC profile for your printer-paper combination you could set that as your output profile, enable "Black point compensation" in Preferences so that the blackest black in your image will match the blackest black your printer-paper combination is capable of reproducing, then enable soft-proofing. You will see what your image will look like if you print it. This allows you to make adjustments and get an instant preview of the result, saving you time and ink on test prints.
The icon with exclamation mark next to the soft-proofing button will gray out areas that cannot be reproduced by your printer, i.e. areas where you will loose details.
You should have a calibrated and profiled monitor in order for the soft-proofing preview to be accurate.
The items you see in the monitor profile combo-box (under the main preview) and in the printer profile combobox (in Preferences > Color Management) are ICC files located in a folder which you can point RawTherapee to by going to "Preferences > Color Management > Directory containing color profiles".