Wanted: channel remapping with implicit colorspace conversion

[Matthew Woehlke]

Matthew Woehlke wrote:
> Alternatively... does de-bayer take four input pixels for one output 
> pixel (i.e. the input is 2x the resolution of the output), or is there 
> interpolation going on as well?

D'oh. 12.3 MP * 14 bits per pixel / 8 bits per byte is approximately 
20.5 MiB, or the size I'd expect for an uncompressed raw from my camera. 
So clearly the answer is "the latter". That being the case...

> If the latter, we could just implement 
> de-bayer as a filter, and simply dump the bayer data as raw i16 data 
> (probably as gray rather than rgb, to save space). Filters would be very 
> strange if you tried to use them on non-de-bayer'd data (for that 
> matter, looking at the image would be pretty strange), but everything 
> would "work".

...how about it? This would even have the advantage that it works *now* 
(assuming convolution-like filters work, anyway! i.e. someone figured 
out how to run filters against tiles when they need neighboring pixels), 
and would be 100% preserving.

Just as soon as we have a white balance filter ;-).

(Hmm... this makes me want to modify DNG format to store tonemapping... 
my lossless-compressed raw's are the *same size* as my high-quality 
JPEG's from rawstudio. There is quite clearly an opportunity to save 
space here, while simultaneously preserving the original data :-). 
Although... I guess the goal is for krita's format to be able to achieve 
that, eh?)

-- 
Matthew
Your eyes are weary from staring at the CRT. You feel sleepy. Notice how 
restful it is to watch the cursor blink. Close your eyes. The opinions 
stated above are yours. You cannot imagine why you ever felt otherwise.
   -- Unknown
(found at http://goldmark.org/jeff/stupid-disclaimers/fun.html)