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Is it possible to store a BufferedImage with transparency in the BMP image format? With 32 bits per pixel this information should be storable. I also don't need a fine gradation of transparency but only is transparent or not. I want to save the image using Java and ImageIO. For this I also use the extensions of TwelveMonkeys.

I need to save it in a directly modifiable format because the image is too large for the memory of the creating program and the program assembles the image piece by piece.

Andrej Istomin
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Skillkiller
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  • https://stackoverflow.com/questions/45487168/writing-a-bmp-with-transparency-using-imageio – MadProgrammer Nov 28 '22 at 01:28
  • Yes thank you. I have also seen this thread but there is no solution. In the comments it only says that it was implemented by myself. Is there any way to get this implementation? – Skillkiller Nov 28 '22 at 01:48
  • Google would be the best place to start – MadProgrammer Nov 28 '22 at 01:59
  • Note that the bmp form is the most memory costly. **png** does lossless compression. You'll need the RGBA/ARGB with Alpha. – Joop Eggen Nov 28 '22 at 09:34
  • I added support for BMP with transparency in TwelveMonkeys years ago, I should probably have updated the other thread... However, I find the statements *"I want to save the image using Java and ImageIO"* and *"the image is too large for the memory of the creating program and the program assembles the image piece by piece"* contradicting. Can you elaborate on how you plan on implementing this? – Harald K Nov 28 '22 at 10:29

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