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I’m experimenting with the "modify quality" function in "save for web" in CS2. I have created an alpha channel that is white where I want good image quality, and black where low quality is sufficient.
Then, I set the quality slider to minimum:10%, maximum:30% and saved the image.
It does what’s expected: The specified parts are at medium quality, the rest of the image at low quality.
But I don’t get a smaller JPEG image file size: The file size of this image thus selectively set to quality 30% is no smaller than the file size I get if I save the entire image at quality 30.
Is my expectation wrong? What is it I’m not getting here?
—
Gregor mit dem Motorrad auf Reisen
http://hothaus.de/greg-tour/
Then, I set the quality slider to minimum:10%, maximum:30% and saved the image.
It does what’s expected: The specified parts are at medium quality, the rest of the image at low quality.
But I don’t get a smaller JPEG image file size: The file size of this image thus selectively set to quality 30% is no smaller than the file size I get if I save the entire image at quality 30.
Is my expectation wrong? What is it I’m not getting here?
—
Gregor mit dem Motorrad auf Reisen
http://hothaus.de/greg-tour/
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