8.2.0 Auto Greyscale Detection

[Junko-Ganan]

Hello, i recently updated my imagemagick version from 7.24 to 8.3.3 but noticed that 8.2.0 contains grayscale updates that make our black borders completely transparent and white completely with white borders on CompositeOperator.Over . I believe this is due to the auto greyscale detection. How would i turn this off?

[dlemstra]

Do you have a code sample that can be used to reproduce the issue?

[Junko-Ganan]

Example.txt

Line:83 is where we write borderstream to imageinstance

Here is the current code being ran. We would have to put together a simpler version that can reproduce the issue for you. 🤔

Discord: Junko#6276 - include this as well in case you would like to see it on screenshare.

[ShadowsAreBlack]

The code above has full gif generation

Q8 8.2+ produces the white screen

Q16 8.2+ produces a completely transparent version

and the one where the border is visible can be replicated with anything below Q16 8.2 which is the desired result.

All using the exact same code

Borders with colors actually work, this only happens to the borders that I have force inverted in photoshop and the ones where I set the saturation to 0 to get a B&W effect

[dlemstra]

Is it possible to create a smaller sample that demonstrates this issue?

[Junko-Ganan]

ExampleCode.txt

Here is a quick example of the code, i just placed imgur images and a write location variable for you to fill out to your specifics. Since our images are hosted locally on filesystem.

[dlemstra]

It looks like this is caused by setting the ColorSpace of the QuantizeSettings. You don't need to set this, and if you remove this setting your issue seems to be resolved.

[Junko-Ganan]

This did solve it, thank you for the help!