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Color banding issue with gradient images in Qt Embedded



  • Hi,

    I am facing color banding issues for gradient images when rendered on arm target. Please help me in solving this issue. Details are as follows,

    I developed a qt application which displays a png/jpeg image(gradient composed), when i execute the application on my DM385 target then i get a very bad image on LCD which is different from original image means to say the image is not dithered enough and color banding issue is seen. I checked the color depth of target, which is 32 bit and qt also renders image as 32bit. Inspite of being same depth i get this issue. I googled a lot to solve this issue but colund'nt find proper solutions. Any help would be really appreciated.

    Thanking you,
    Athavan



  • Hi, I think it would help if you can provide some screenshots to compare the issue.
    Also to be sure it is a problem with the image/color and not the screen / monitor on the device maybe?



  • Hi,

    I am attaching the screen shots, please compare it and help me in solving this issue.

    http://fossilshale.com/guest/Qt/1_image.jpeg
    http://fossilshale.com/guest/Qt/2_image.jpeg
    http://fossilshale.com/guest/Qt/3_image.jpeg

    Thanking you,
    Athavan



  • Hi, to be honest I can't see any difference but the photos are very bad, can't you do digital screenshots from the device itself?
    But the pictures look identical to me..


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