Re: [CinePaint] strange handling of SIGTERM

On Tue, Aug 18, 2009 at 7:15 AM, Milan Knížek<[email protected]> wrote:
> Gene Selkov píše v Út 18. 08. 2009 v 00:11 +0100:
>> 3. While zooming in or out with '+' or '-', the window does two
>> strange things: (1) it grows; and (2), it re-positions itself. I end
>> up chasing the window all over my screen. I wonder whether this
>> behavior is optional and can be turned off.
>>
> This is in settings (Interface tab) - change window size on zoom
> (loosely translating from a localised version).

Yes, it's labeled "Resize window on zoom" in my locale. It could be a
useful feature, if it the resizing only occurred within pre-set bounds
and if -- more immportantly -- it preserved the viewport center.
Alternatively, it could perhaps be useful if it preserved the pointer
position relative to the image. Otherwise, the amount of mouse travel
and clicks needed to chase the self-resizing window is no smaller than
would be needed to simply drag a corner.

> There are two different things a display profile can do: (a) it sets the
> display to a calibrated state (via changing LUT) and (b) it describes
> the calibrated display colour space.
>
> (a) is done with dispwin and other LUT loaders. Cinepaint cannot do
> that.

I still wonder whether it assumes the LUT has been loaded or not, or
whether such assumption would even be relevant.

> Some of these tools also update the XICC property of X.org with the
> actual profile data

I also wonder whether that could lead to a double application of the profile.

> so that some application can utilise the "system"
> display profile and do not require the user to set it specifically in
> Preferences (GIMP, EoG, UFRaw and few others can do it, but CinePain
> can't). From its principle, also colour non-managed application may
> benefit from a calibrated display (if it was calibrated close to sRGB
> gamma and its colour space is close to sRGB).

How close would close be? I just compared them using ICCView; the
result is interesting. My display profile is about 3-4 times smaller
in volume, all contained within sRGB; it has a roughly similar shape
but it looks like it suffered a fender-bender in the green corner:
there it is rather more squashed towards the center than everywhere
else.

> (b) is used by colour aware application like CinePaint. What CinePaint
> does is that it converts on-the-fly from the Image profile to a display
> profile. You can do the same e.g. with ImageMagick tools ("convert
> -profile AdobeRGB.icm input.tif -profile display.icc -intent Perceptual
> image_for_display.tif") and then display the image with colour non-aware
> application (I guess evince, gThumb and ImageMagick's "display") and
> compare.

Now we're getting somewhere. I just did:

convert image.tif  -profile
/home/selkovjr/.color/icc/m4300-current.cal.icc -intent Perceptual
image-display.tif

and ascertained that "image-display.tif" looks identical to
"image.tif" in Cinepaint.

(for the record, IM's "convert" doesn't need the input profile
parameter if the profile is embedded in the input file -- in this
case, it is LStar-RGB; the output profile is the same as I applied to
my display with "dispwin")

However, when I convert it to sRGB (which is what my printer expects,
or a web browser), it looks drastically different. I am not sure I can
describe the difference, but overall it is quite desaturated, I see
what seem to be value inversions in some areas, and the areas most
affected appear to coincide with those marked in gray in "Gamut Check
Display": these are the darkest spots that show quite a bit of detail
in Cinepaint but become nearly black in the converted sRGB image.

Is it even reasonable to expect an sRGB output to look similar to what
I see in Cinepaint, where my workspace is LStar-sRGB?

Thanks,

--Gene

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