Transparency display error in Photoshop after reducing a transparent image to 72 dpi

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  • Updated 5 years ago
When we try scale a picture with transparent background and adjust it to a smaller size and reduce the resolution to 72 dpi (maybe from 300 dpi) at the same time, it will end up with a reduced image with correct adjustments, but with a Photoshop display error: There are vertical and horizintal patterns which show transparency in the whole image, where no transparent pixel will be.

In other programms these pictures will be displayed in a right manner, without these patterns of transperent lines, but not in photoshop. Even after you close the program and reopen the false displayed picture again, photoshop keeps this behaviour of ghost transparency.

Problem appears with photoshop 5.5 and 6 and on 3 different computers.
Display error will not apear if you do not adjust resolution to 72 dpi and a smaller pixelrate at the same time and only happens with the aimed resolution of 72 dpi.
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Stefan Fichtel

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Posted 5 years ago

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Stefan Fichtel

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The above picture is what Photoshop displays and the one beneath how the correct look will be displaed in preview (MAC)
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Stefan Fichtel

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And that's the source image
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Chris Cox

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See what happens if you disable GPU usage in Photoshop, restart Photoshop and try that again. It looks a lot like a video driver issue.
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Stefan Fichtel

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Hi Chris,

no GPU Usage has no influence on this. The patterns are exatcly the same on any Desktop we tried. In this example you can see only horizontal lines, but usually there appears a strange mixture of horizontal and vertical broken line patterns within areas where no transperency should be shown anyway.

Do you have any other idea?

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Stefan Fichtel

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OH sorry!

You where right. I just thought i had to restart Photoshop and then GPU usage was reactivated automatically. If i deactivate it now without a restart, it works fine.

But what does that mean now? Should i set the preferences to "minimal" instead of "normal"?

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Chris Cox

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It means that your video card driver has a bug, and needs to be updated.
Go to the website of your GPU maker (Nvidia, AMD/ATI, or Intel) and update the driver.