RFR: 8326027: [TEST_BUG]Comparing buffered images of white background frame fails in Mac

[Alexey Ivanov]

On Tue, 3 Sep 2024 09:37:50 GMT, Tejesh R <tr at openjdk.org> wrote:

> > This is why I asked the question: does the comparison remain accurate without the need for tolerance if you use `Robot.createMultiResolutionScreenCapture` and use the highest resolution from the returned multi-resolution image?
> 
> I couldn't reproduce the issue neither with `Robot.createMultiResolutionScreenCapture` nor with `Robot.createScreenCapture` since the failure occurs intermittently, not able to say anything about using `Robot.createMultiResolutionScreenCapture` instead of `Robot.createScreenCapture` .

According to your report in JBS, the white color is not exactly white: `0xFFEE'EEEE`. White color has value of `0xFFFF'FFFF`.

However, it's also common on Macs (because of color profile applied?), I mean that the captured color value is the same as the value used for filling.

At the same time, I expect the color is the same across the entire frame surface. What we see is that there are variations. I wonder how many pixels on the image have different color, other than the first pixel.

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PR Comment: https://git.openjdk.org/jdk/pull/20760#issuecomment-2338839726