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ColorSpaces
ColorSpaces
each action layer in delaboratory is available in each colorspace, and in each case it will work differently, if you want to explore delaboratory it's a good idea to try each colorspace and see how they can be used delaboratory supports 9 color spaces:
sRGB is the most popular color space, every color is a mix of Red, Green and Blue ProPhoto is similar to sRGB but has wider gamut, it means that some colors outside sRGB colorspace can be presented in ProPhoto, this is important when you open RAW file and its colors are clipped in sRGB but are not in ProPhoto - during the edit you can save the details in highlights or shadows BW is just single channel grayscale representation of image, it's very important to control the process of color -> BW conversion and understand how BW image can be used to improve the final color image, there are multiple books on this subject LAB is famous colorspace which separates luminance from color, many applications fully work in LAB colorspace inside, because it's so good in post processing, LAB is also very wide colorspace (wider than ProPhoto) LCH is similar to LAB, but instead "not so user friendly" A/B channels there is a chroma (saturation) and hue, so if you want to play with saturation without changing balance of colors - it's better than LAB CMYK is the only colorspace which has 4 channels, that's why it's special and that's why it's so powerful, most people don't understand why this colorspace can be used in post processing and they just associate CMYK with printing, that's why it's not available in many Free Software projects at all HSV/HSL are old colorspaces which separate luminance from color, but they don't make it so well as LAB/LCH, but they are quite famous so they are available |
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Strictly speaking there is no RGB colourspace. RGB defines a colour model which is used by an infinite variety of colourspaces, each defining its own space out of the defined colour gamut. This is the reason you need to diffrenetiate between sRGB, Adobe RGB and others because definition of the colour in RGB will vary from one space to another unlike say in LAB.
Alexey you are right, I will probably change RGB to sRGB.
What does the support for ProPhoto? actually mean? My understanding was that when you read the RGB file it is internally stored as 32bit fp so no RGB space is applicable to it once you start doing the conversions? Or is it just to create an output file in certain RGB space? If it is the latter, why not implement the generic conversion to any output colour space? The ProPhoto? is ok but you ar copying PS/LR in that and this is one of their decisions that is rubbish really. It has a lot of imaginary (out of gamut) colours that neither print or display well and is so wide than when converted to it can cause colour posterisation. The BetaRGB, EciRGB or at least AdobeRGB would be a better choices but since it is all individual perhaps as I said it could be implemented to just generically convert it into any output colour space for saving the results?