Linear light scaling

[Martin Renold]

hi Boud

On Wed, Mar 28, 2012 at 06:08:36PM +0200, Boudewijn Rempt wrote:
> 
> I tested today in krita -- it's a little known thing that Krita supports a
> linear-light workflow perfectly well.  Basically, it's a matter of using
> the right icc profile to define the working space and the example Andrew
> showed just works in Krita.

I did certainly notice this feature :-) I have been testing this against the
"linear light" branches of MyPaint.  It's nice to have a second
implementation to compare with, when developing.

However I noticed something: Krita seems to zoom the display always in sRGB.

The linear-light branch from MyPaint isn't perfect in this respect, neither:
it does most of the zooming (namely, the mipmap) in linear light, but the
final step (IIRC the final 0%-49% zoom + rotation) is done in sRGB.

For me the main selling point of linear light, which changed my oppinion
from "nice to have" to "must have", was the prominent difference that it
makes for thin white ink strokes on black background when zoomed out[1]. 
I have even seen this on a printed image - a line that you have barely
noticed on the screen can suddenly become prominent.

In Krita, I created a 16bpc image with the profile labeled "linear light". 
I painted a couple of tiny white lines on pure black, and when I zoom out
the displayed image becomes clearly too dark.

So I was wondering if this is a known limitation? Or is there a way to
change this behaviour already?


[1] http://maxy.homeip.net/misc/linear_light_scaling.ogv

-- 
Martin Renold