On 18.11.2015 11:49, FRIGN wrote:
> On Wed, 18 Nov 2015 11:16:56 +0100
> Stefan Mark <mark_AT_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 :)
Received on Wed Nov 18 2015 - 12:36:51 CET