XPost: misc.phone.mobile.iphone, comp.mobile.android   
   From: klee@unibwm.de   
      
   On 2/21/2026 3:44 AM, Maria Sophia wrote:   
   > Herbert Kleebauer wrote:   
      
   > 1. Pixel-level purity   
   >     As you said, if the original image contains only one RGB value, then   
   >     every pixel in the screenshot will also contain that same RGB value.   
   >     Zooming in won't reveal anything else. That part is guaranteed.   
      
   Nothing is guaranteed, there always can be software bugs. For example,   
   I also tried to save the 1 pixel bitmap with Firefox on my tablet, but   
   it failed. The saved picture had a few extra bytes and was no valid   
   bitmap file. Don't know whether the bug is in Firefox or Android, but   
   doesn't matter, the result is the same: it doesn't work.   
      
      
   > 2. File-level purity   
   >     Even though the pixels remain uniform, the *saved file* may still   
   >     contain extra metadata, color-space tags, or compression artifacts   
      
   I didn't test it, but I really hope that in pictures with only one color   
   there are no compression artifacts. Save the picture with high compression   
   as jpeg and then open it in Irfanview and check if there is any other   
   color beside the one chosen.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)