Raw image files save the data obtained by digital cameras and scanners with practically no information loss. Yet, since they are not fully processed, the images cannot be printed or edited with common bitmap graphics editors. RawTherapee is intended to work with RAW photographs, which means that it allows making various types of adjustments to the image. In addition, it can also edit other formats, including BMP, TIFF, and PNG.
The program has a nice and intuitive interface, which resembles that of a file explorer. Thus, it lets you browse through your disk and preview the photos stored there. However, it is used quite differently from other similar software, which might make the learning curve steeper.
Most of the editing you can perform with this tool is related to enhancing the quality of the picture. In this regard, it lets you sharpen, reduce noise, defringe and change contrast levels. Likewise, it supports adjusting white balance and vibrance, mixing channels, equalizing HSV, managing colors and demosaicing. Also, some optical anomalies can be fixed, including flat fields, dark frames, black points and chromatic aberration. Moreover, just like standard picture editors, RawTherapee helps you carry out other more frequent operations, such as resizing, rotation and cropping.
Luckily, the program works without altering the original file. Instead, it lets you save the results as JPEG, PNG and TIFF files. Besides, its multi-threaded algorithms can process any change in practically no time and with very accurate results, even when batches of pictures are being edited simultaneously.
In general, RawTherapee can come in handy to process RAW images. It can be perfect for experienced photographers. It is also excellent news that this product is open source, which means you can use it at no cost. Additionally, the program has the advantages of being cross-platform and supporting command line usage.
v5.4 [Apr 3, 2018]
New default processing profiles, now the default look for raw photos closely matches the out-of-camera look with regard to tones and includes lens distortion and vignetting correction.
- New histogram matching tool, to have RawTherapee automatically adjust the image for you to match the out-of-camera look with a single click of a button.
- New HDR Tone Mapping tool to compress the light in scenes with a high dynamic range, allowing you to show details in both shadows and highlights in a realistic way.
- New Local Contrast tool to boost clarity using a simple interface.
- New color toning method L*a*b* Color Correction Grid.
- New RCD demosaicing algorithm to minimize artifacts even with artificial lighting and strong chromatic aberration.
- New thumbnail overlay icons in the File Browser and Filmstrip to help you distinguish normal images from HDR and Pixel Shift ones.
- Added support for showing out-of-gamut areas based on the output profile.
- Added support for reading and writing metadata and ICC profiles to and from PNG images.
- Added support for processing Sony Pixel Shift ARQ raw files - make sure that the ARQ extension is enabled in Preferences > File Browser > Parsed Extensions.
- Create Sony ARQ raw files using https://github.com/agriggio/make_arq
- Added support for saving 32-bit floating-point TIFFs clamped to [0;1].
- Added profiled chromatic aberration correction support using Lensfun.
- More tools now have an on/off switch.
- The user interface is cleaner, with all power-house tools moved into a new "Advanced" tab to prevent slider-shock to newcomers.
- The Metadata tab now lets you choose whether you want to copy metadata unchanged, edit metadata or strip metadata when saving images. Now you can also make metadata changes in batch mode.
- The choice of whether the main histogram should display information using the working profile or the output profile is now available from the Editor tab's top toolbar.
- The Crop tool's aspect ratio now defaults to that of the image, and RawTherapee automatically zooms-to-fit the crop once it's placed.
- RGB input-type ICC profiles can now be used as output profiles.
- The saved reference image for profiling (created from within the Color Management tool) now contains metadata.
- PNG and compressed TIFF images make use of better compression.
- Shortcut key changes: Zoom-to-fit the crop using "f", fit the whole image using "Alt+f".
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