save bitmap to SdCard

[alex ki]

hi Guys
im using that code to save bitmap to SdC

String writeTo = new File(Environment.getExternalStorageDirectory()+ File.separator + "photo.png")	.toString();				 
FileOutputStream output;
output = new FileOutputStream(writeTo);
bitmap.compress(Bitmap.CompressFormat.PNG, 0, output);
output.close();

the problem is thati dont want to compress the bitmap , mean don't want any change on pixels ""bits""

[Ulf Dittmer]

PNG is a lossless image compression format (as opposed to JPEG, for example). Have you actually experienced pixels being changed during a roundtrip compression/decompression?

[alex ki]

Ulf Dittmer wrote:PNG is a lossless image compression format (as opposed to JPEG, for example). Have you actually experienced pixels being changed during a roundtrip compression/decompression?

i done it with these steps :
get R,G,B from every pixel and convert it to Binary array then change the LSB to 0 or 1
then convert it from binary to dec
then set-pixel method

after that i save it with the code above
i don know where the problem is :S