If you edit the identity image and change that pixel to be less red, say more orange, then save this modified identity image as a new HaldCLUT file, then whenever you use that file RawTherapee will make the same change to all pure red pixels. These programs known that a pixel at position x=143 y=0, for example, should be pure red, RGB=(100%, 0%, 0%). The "in" or "source" values are known to all programs which support HaldCLUT images. These numbers are the "out" or "result" values. Though the HaldCLUT image looks like a set of gradients, what it really is, is a graphic representation of a matrix of numbers. Only global adjustments such as the ones listed should be applied - local adjustments are incompatible with how this works for example you cannot make a HaldCLUT image give a tone-mapped look, it cannot denoise, it cannot sharpen, but it can make skin tones look more tan, and foliage more vibrant. To create a "look", the identity image is opened in an image editing program - any image editing program - and the colors are modified in some global way, for example using levels, curves, adjusting hue and saturation, etc. Applying an identity HaldCLUT to a photo will result in no change at all. The neutral, unaltered state is called an "identity HaldCLUT image". A HaldCLUT image contains a set of gradients of various hues arranged in a matrix. "CLUT" means "Color Look-Up Table", while what "Hald" means is anyone's guess. The Film Simulation tool uses specially prepared images in what is called a HaldCLUT pattern. The level 12 Hald_CLUT_Identity.tif image. As you can see, there is no reason to worry when using HaldCLUTs as long as you use a dedicated folder as suggested, keeping only HaldCLUT images in it. If, however, you were to accidentally tell RawTherapee that the HaldCLUT folder is C:\Program Files (x86), then the startup time could even take several minutes, as that folder contains hundreds of thousands of files. To give you an idea of how the startup time is affected, the difference between having 0 images in the HaldCLUT folder and having 500 images in it (that's more than in our collection) results in a 100ms startup time difference - that's nothing. Should that happen, just click the button in the popup to stop the scan, then go to "Preferences > Image Processing > Directories" to see which folder is being used, and either point RawTherapee to a folder which contains only HaldCLUT images and nothing else, or to an empty folder if you don't want to use the Film Simulation tool. As a safety measure, you will be warned if scanning the folder on startup takes more than 10 seconds. RawTherapee will scan the designated HaldCLUT folder every time you start the program, that's why it is important that you create a folder which you will use only for storing these HaldCLUT images and nothing else, so that RawTherapee does not waste time scanning unrelated files. 6 RawTherapee Film Simulation Collection.Once you have them ready in a folder, go to "Preferences > Image Processing > Directories" and set "HaldCLUT directory" to the appropriate folder. The first time you run this tool you will see a message informing you that you need to point RawTherapee to a folder which contains the reference images. You can download our collection, called the RawTherapee Film Simulation Collection, or you can design your own - more on that later on. RawTherapee needs to be able to access these HaldCLUT images in order that you can use the tool. Though the look can be based on anything, most of the reference images we ship are based on classic film stock, ergo the tool's name. Each HaldCLUT image corresponds to one "look". This tool requires the use of reference images in the HaldCLUT pattern, in either PNG or TIFF format. The Film Simulation tool allows you to match the colors of a photo to a reference image with a single click. The Film Simulation tool can change the look of a photo to match a film stock with a single click.
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