Resize Filter causes image to shift color (more contrast)

[fireattack]

When Resize Filter is enabled, the color of the image changes.

Below is an example.

The image is a pure 128,128,128 grey image.

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After enabling Resize Filter, image becomes 136,136,136:

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It doesn’t matter which interpolation I use, they all cause this issue.

[Tttt]

Does your image contain an ICC profile? If it does I think we are having the same problem.

ICC profile colors seem to be ignored if resize filter is on.

Example image (download and open it in NeeView):

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I did some testing and tried enabling susie’s ifjpeg plugin. The problem doesn't exist with susie as it probably applies the ICC profile to the image before sending it to NeeView.

[fireattack]

Nope, my image don’t have ICC.

But I can only reproduce this bug with greyscale (i.e. 1 channel only, 8bit in total) image (bmp, jpg, or png), just like the one you posted.

Below is another one I used.

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[Tttt]

I can’t reproduce the problem using your image. (sha1= 96a47a49264e1e18352b3804645b306dea5ca355)

The color is 128,128,128 at any point (100% zoom / 105% zoom / resize enabled / resize disabled)

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[Ito Mitsuhiro]

When I tried it, I confirmed this phenomenon on Windows7.
It could not be reproduced on Windows10.

Is your environment also Windows7?

[fireattack]

Yeah, I use Win7

[Ito Mitsuhiro]

thank you. I will investigate.

[Ito Mitsuhiro]

MagicScaler を 13.0 に更新。 これによりリサイズフィルター適用時に明るさが変化する問題が解消されました。 (fixed #1205)

→ <<cset eb7a9e9b0727>>