On 18.11.2015 11:49, FRIGN wrote: > On Wed, 18 Nov 2015 11:16:56 +0100 > Stefan Mark <m...@unserver.de> wrote: > >> What i meant, instead of having RGBA and only RGBA, it could have a flag >> that says either which color model is used, (like rgb, rgba, lab, >> monochrome, ...) or define how many color channels the image has, either >> named or by giving the channels wavelength. > > you don't need a specialized format for RGB-data. If the alpha-channel > is always 65535 (maximum), the compression will take care of it. > I already went down the LAB-path. It may be the superior colorspace, but > nobody uses it anyway. and it's painful to work with. > monochrome data is a special-case of paletted images, and farbfeld in > its current state is _superior_ in handling this. > If you only have black, green and pink pixels in your image, the > compression algorithm will handle this perfectly. same applies to > greyscale images. > >> That would allow for example scientific images to be stored (eg, r,g,b >> channels as well as a few infrared ranges and a bit of uv, maybe imaging >> radar, ...), or arbitrary image-like data (eg pressure, temperature, >> tensile stress, ...), or special colors for printing (eg cmyk and >> metallic color, glow-in-the-dark-color, transparent coating, ...). > > The point you are missing here is that RGB is not a color model based on > the true physical perception of color. > LAB gets closer, but you can't really "easily" mix LAB color-data with > IR-data, because we can't see infrared light, and the three axes of the > LAB-color-space only take in regard those color-ranges perceived by our > eyes. I guess you could encode Infrared data, given the axes are > unlimited, but how does this help? > It all boils down to assigning infrared-data to color-data we can > perceive, and there's no reason not just to use Farbfeld RGBA for that. > For instance, when you have an IR-camera from your military drone, you > just map it smartly onto a greyscale 16-Bit range and be done with it. > I think i see. Sure, for visual representation, 16 bit wide rgba is probably more than enough.
What i proposed was to expand the format to be useful beyond representing visual images but represent arbitrary image-like data. Probably completely out of the projects focus, sorry, got carried away :)
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