Bitmap color change while compressing to png

Question

I\'m currently working on a steganogrpahy android app as a class project. I\'ve created an object that will encode an image with in another image and return an encoded bitma

Answer 1

For anyone who stumbles upon it, like me, wondering why bitnap colors change once you write it out in PNG. I have found out that using bitmap.setPreMultiplied(false) before calling bitmap.compress(PNG, 100, fileout) preserves the color of your image if it has alpha channel values. Setpremultiplied prevents the pixels written onto disk from being multiplied by alpha channel, thus generating different pixel color values.