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: Gregor Schmid <Gregor.Schmid@?.de>
• Date: Wed, 25 Nov 2015 19:24:43 +0100

Hello Marek,

sorry, I almost forgot to answer.

Thanks for your suggestion and the explanation, it sounds interesting.
We're looking into it and will give it a try. If the result is good
we'll probably add an option.

Best regards,
    Greg

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

> 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,
> Marek
>
> -----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,
>     Greg
>
> "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
>> https://www.qfs.de/mailman/listinfo/qftest-list

--
Gregor Schmid

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

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

• References:
  • [QF-Test] Feature request: Inverted XOR and difference for image checks
    • From: Nedvěd, Marek
  • Re: [QF-Test] Feature request: Inverted XOR and difference for image checks
    • From: Gregor Schmid
  • Re: [QF-Test] Feature request: Inverted XOR and difference for image checks
    • From: Nedvěd, Marek

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