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Editorial Team
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Asked: 2026-06-10T03:33:46+00:00

In order to minimize the memory usage of bitmaps, yet still try to maximize

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In order to minimize the memory usage of bitmaps, yet still try to maximize the quality of them, I would like to ask a simple question:

Is there a way for me to check if a given image file (.png file) has transparency using the API, without checking every pixel in it?

If the image doesn’t have any transparency, it would be the best to use a different bitmap format that uses only the RGB values.

The problem is that Android also doesn’t have a format for just the 3 colors. Only RGB_565, which they say that degrade the quality of the image and that should have dithering feature enabled.

Is there also a way to read only the RGB values and be able to show them?

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  1. Editorial Team

    i’ve found the next links which could be helpful for checking if the png file has transparency . sadly, it’s a solution only for png files . rest of the files (like webP , bmp, …) need to have a different parser .

    links:

    http://www.java2s.com/Code/Java/2D-Graphics-GUI/PNGDecoder.htm

    http://hg.l33tlabs.org/twl/file/tip/src/de/matthiasmann/twl/utils/PNGDecoder.java

    http://www.java-gaming.org/index.php/topic,24202

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