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Re: [QF-Test] Feature request: Inverted XOR and difference for image checks

  • Subject: Re: [QF-Test] Feature request: Inverted XOR and difference for image checks
  • From: Nedvěd, Marek <m.nedved@?.de>
  • Date: Fri, 20 Nov 2015 15:13:24 +0000

Hello Greg,
I made a misunderstanding here, because I described both highlighted difference and xor.
The highlighted difference is actually helpful if there are really just small differences and should be as it is.

The xor is what I wanted to be inverted. See, if you just xor the colors, you will get the negative of the image, so if you invert it, you will get the colors right, and the similarities will be white. This can be useful when you have a slight difference in a colored graph with multiple lines. If the image would be inverted I can directly see which line has offset.

Best regards,

-----Original Message-----
From: Gregor Schmid [mailto:Gregor.Schmid@?.de]
Sent: Wednesday, November 18, 2015 6:20 PM
To: qftest-list@?.de
Cc: Nedvěd, Marek
Subject: Re: [QF-Test] Feature request: Inverted XOR and difference for image checks

Hello Marek,

for me, the difference image is the most important one in cases where there is no offset and minimal differences in the color values, so it can't be spotted in any of the other versions. In the difference image, the pixels with different values clearly stand out and when you move the mouse pointer of such a pixel you'll see both color values shown above the image.

In such a case, the actual difference between the values is so close to black anyways, that your suggestion - is I understand it correctly
- would only result in an inverse of the current difference image.

Best regards,

"Nedvěd, Marek" <m.nedved@?.de> writes:

> Hello QF Test people,
> I would like to ask for a feature request for the image comparison.
> The images in the run-log are good. Expected and actual images are
> very helpful and the controls to compare them side-by-side, under each other or just to switch them are great.
> My only concern is with the xor and difference. If there are some
> obvious differences, then it is ok, but when there are just small
> differences, like small offsets or slight differences in colors, then it is not very pleasant to use.
> I suggest to deduct the resulting pixel color from black. Then most of
> the diff picture will be white and the differences will be in the actual color of the difference.
> But maybe it is just me, so I would like to ask for some feedback for
> this feature, if anyone is happy with it, please reply.
> Best regards,
> Marek Nedved
> _______________________________________________
> qftest-list mailing list
> qftest-list@?.de

Gregor Schmid

E: gregor.schmid@?.de
T: +49 8171 38648-11
F: +49 8171 38648-16

Quality First Software GmbH | Tulpenstr. 41 | 82538 Geretsried | Germany GF Gregor Schmid, Dr. Martina Schmid, Karlheinz Kellerer HRB München 140833