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Grey image

Posted: Thu Oct 19, 2017 8:01 pm
by Dave-H
Hi again, the file associations are working fine again in Windows XP now, thanks!
However, there is another issue, which was also there in 2.42.
Some (but not all) of my greyscale JPG and PNG images are appearing bright red or magenta instead of black and while when viewed with XnView.
This was not the case with the older version that I was using.
Is this a settings problem or a compatibility problem?
I've attached a copy of one of the affected files.
Thanks, Dave.
:)
Chequebook Pages.jpg

Re: Grey image

Posted: Fri Oct 20, 2017 6:40 am
by xnview
i can't reproduce, could you post a screenshot?

Re: Grey image

Posted: Fri Oct 20, 2017 11:33 am
by Dave-H
Thanks Pierre!
I've attached a couple of screen grabs.
The first is the image I attached last time, the second is a large PNG image that shows the same problem, but is sometimes red and sometimes magenta, as here. The first one, the JPG, always seems to be red.
There are some others with the same problem, but I haven't been able to identify what they have in common!
They print fine, and their thumbnails are fine, it's just the normal view in XnView which is wrong.
Cheers, Dave.
:)
Image1.jpg
Image2.jpg

Re: Grey image

Posted: Fri Oct 20, 2017 1:30 pm
by xnview
really strange :) could you send me your xnview.ini

Re: Grey image

Posted: Fri Oct 20, 2017 1:43 pm
by Dave-H
Here it is!
It's in a zip file as the forum will not allow ini files as attachments it seems.
:)
xnview.zip
(6 KiB) Downloaded 67 times

Re: Grey image

Posted: Sat Oct 21, 2017 3:39 pm
by xnview
:bugconfirmed: i can reproduce now

Re: Grey image

Posted: Sat Oct 21, 2017 4:26 pm
by Dave-H
That's good!
Is that only when using my ini file?
If so I take it that it's presumably a settings problem somewhere then.
:)

Re: Grey image

Posted: Sun Oct 22, 2017 8:06 am
by xnview
in you xnview.ini, you can change UseAlpha=1

Re: Grey image

Posted: Sun Oct 22, 2017 11:42 am
by Dave-H
Thanks Pierre, that has fixed it completely!
Where is that setting in the GUI as a matter of interest, and is there any downside to setting it to 1?
There is also an "IgnoreAlpha" setting in the ini file, which on one of my installations is set to 0, and the others it's set to 1.
Which is the best setting for that parameter?
Cheers, Dave.
:)

Re: Grey image

Posted: Sun Oct 22, 2017 9:30 pm
by XnTriq
Dave-H wrote:Where is that setting in the GUI as a matter of interest, and is there any downside to setting it to 1?
There is also an "IgnoreAlpha" setting in the ini file, which on one of my installations is set to 0, and the others it's set to 1.
Hi Dave (-:
  • UseAlpha=0/1
    • View mode: ViewUse alpha channel
  • IgnoreAlpha=0/1
    • ToolsOptions...GeneralOperationsIgnore alpha channel
And here's an image with an alpha channel for you to test the effects of these settings: logo.png

Re: Grey image

Posted: Sun Oct 22, 2017 10:48 pm
by Dave-H
Thanks, that's extremely helpful!
The logo displays properly with IgnoreAlpha=0 and UseAlpha=1, and my greyscale images all display fine with those settings too.
I'm not sure why you would want to use any other settings, but I guess they're useful for testing purposes.
Thanks again, much appreciated.
Cheers,
Dave.
:)

Re: Grey image

Posted: Sun Oct 22, 2017 11:45 pm
by XnTriq
Dave-H wrote:I'm not sure why you would want to use any other settings, but I guess they're useful for testing purposes.
2.png (optimzed) and 1.png look identical if Ignore alpha channel is disabled and Use alpha channel is activated, but when you turn off Use alpha channel, XnView reveals the otherwise hidden differences underneath/behind the alpha channel mask in view mode as well as the thumbnails.

See also:

Re: Grey image

Posted: Mon Oct 23, 2017 10:58 am
by Dave-H
Thanks!
:)