how to reduce bits per pixel in an image?

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Anusha
Anusha 2014-2-26
评论： Image Analyst 2014-2-27
If my image in the format of png.. i need to compress this image..so image bit per pixel will be reduced? how this is possible

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回答（2 个）

Nitin
Nitin 2014-2-26
Check the imresize function in Matlab
Image Analyst
Image Analyst 2014-2-26
Using imwrite to create a PNG image does the compression for you. Why do you think you need to do anything additional?
  2 个评论
Anusha
Anusha 2014-2-27
after writing the png format. now i want to apply this image to png codec, again it compressed or not?
if writing the gif image to png format.. how much it will be reduced size.
Image Analyst
Image Analyst 2014-2-27
What GIF image? Images only have a format once they're saved onto disk. Once they're in MATLAB, they're simply an array of numbers. If you use imread() it uncompressed them. They're no longer compressed - it's the full, original array again. The only way to get the compressed data out is if you use fread() but if you did that it's not in a displayable form.

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