how to get same image quality with bit depth after filter?

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Selva Karna
Selva Karna 2018-5-29
评论： Florian Morsch 2018-6-4
how to get same image quality with bit depth after filter?
if my input image 55Kb, output i want same 55kb, how can i get same quality ?
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KALYAN ACHARJYA
KALYAN ACHARJYA 2018-6-3
rgb=imread(a);
%%rgb image [input image file size] 87kb
First Image rgb is a color image, now you convert it to gray level image, how you expect the both should be the same size.
Gray=rgb2gray(rgb);
imwrite(Gray,'output.jpg')
%%but output image size 71kb
Florian Morsch
Florian Morsch 2018-6-4
If you convert a image to grayscale you will loose some data, thats how it works. The result is a smaller image datawise, you cant prevent that and that data loss has nothing to do with quality change, its just your pixel turning from RGB to gray.

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