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Android_Developer February 2016

Compressing image in android is loosing the quality when image is taken from phone camera

I am using this method for compressing the image https://gist.github.com/ManzzBaria/c3af85b708fee49d55f7

but my images are loosing quality after compression. it is worse when an image is take from phone and compressed.

Please let me know where I am doing wrong.


kwinkunks February 2016

Reducing the size of the image takes pixels away, effectively reducing the resolution of the image. Of course, the file also gets smaller. If you save as a high-fidelity JPEG (say 95%), this may be all the file size reduction you need.

Reducing the size of the file with a lossless method (eg PNG) will achieve a reduction in file size with no loss of quality — hence the name. The reduction depends on the image: a picture with many identical pixels, eg a screenshot of this page, will compress substantially.

Using a lossy method (eg normal JPEG compression) will result in an even smaller file, but you will pay for this reduction with a loss of quality. Most methods of saving JPEGs allow you to choose a fidelity, often 80% by default, which controls the quality of the resulting image; this is the line that does it in the code you posted:

scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);

Again, the reduction you achieve is inversely proportional to the complexity of the image, as well as to this fidelity parameter.

Here's a blog post I wrote on choosing image formats: How to choose an image format. This one might also be worth reading.

There are more good links on lossy vs lossless compression in @Gavriel's answer.

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Asked in February 2016
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