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the alpha value is not correct after compression by tct mac v4.2

hi guys, i just find the alpha value become much smaller after compression by Mali GPU Texture Compression Tool v4.2 mac version, this problem also happens in the latest version v4.3, but it works well in windows version, is it a valid issue? will it be fixed in the future version? thanks.

i guess the alpha value has been squared. 26/255 = 0.10196, 90/255 = 0.32594, 0.32*0.32=0.1024ScreenShot.jpg 

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  • Hi Wenbo

    I'm sorry to here that did not work for you. As it stands I am not sure why you are experiencing this problem still. I will raise a ticket internally against the TCT to get this resolved in the next release.

    In the meantime my only suggestion is to try an alternative ImageMagick binary. Possible alternatives are ImageMagick installer for Mac OS X or Homebrew or MacPorts , however having not used / tested these I cannot confirm there suitability.

    Alternatively the Windows and Linux builds of TCT are known not to suffer from this problem, so if you have easy access to either you may prefer that option instead.

    Regards

    Ben

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  • Hi Wenbo

    I'm sorry to here that did not work for you. As it stands I am not sure why you are experiencing this problem still. I will raise a ticket internally against the TCT to get this resolved in the next release.

    In the meantime my only suggestion is to try an alternative ImageMagick binary. Possible alternatives are ImageMagick installer for Mac OS X or Homebrew or MacPorts , however having not used / tested these I cannot confirm there suitability.

    Alternatively the Windows and Linux builds of TCT are known not to suffer from this problem, so if you have easy access to either you may prefer that option instead.

    Regards

    Ben

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