Saving Jpeg Files In Android With No Loss Of Pixel Information

I'm loading a jpeg-file via BitmapFactory and try to save it again (later I want to do some calculation on the pixel data before I save it again). But if I try to save it with File

Solution 1:

Is there a possibility to safe it lossless?

No. The JPEG format uses a lossy compression. It makes no formal guarantees even if you set the quality to 100.

Or is the problem already when I load the picture with [...]

No, bitmaps are... maps of bits, i.e. they represent the exact bits of the image data.