image processing

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I want to programatically delete some pixels that are unused in order to reduce the image size.

Can anyone tell me how to reduce the size of an bitmap image file without changing the pixels values.. (i.e the RGB Components)

Posted 12-Oct-10 22:20pm

Be Yourself

Updated 13-Oct-10 3:50am

Kschuler

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Kschuler 13-Oct-10 9:50am

Edited question - I removed the code block since it wasn't code. Makes it easier to read.

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CPallini · Answer 1 · 2010-10-12T22:23:00

Solution 1

In order to reduce image the size (on the storage medium) you may just compress it (for instance using jpeg file format).
:)

Posted 12-Oct-10 22:23pm

CPallini

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Be Yourself 13-Oct-10 4:34am

But JPEG Format will change the pixels RGB values as it was in bmp file.
I want to retain the RGB Values and remove some unused pixels to reduce the size can u suggest anything..

Be Yourself 13-Oct-10 4:36am

I have tried the method U R thinking and I got the problem plz suggest any other method

CPallini 13-Oct-10 4:38am

You may use lossless compression (even jpeg lossless compression). What do you mean with 'unused pixels'? As far as I know there aren't 'unused pixels' in a image.

Be Yourself 13-Oct-10 4:48am

Actually I am manipulating with pixels.
Suppose I have an Image of Size (10x10) there are 100 pixels and I have used 50 pixels whose RGB values I have fixed according to my requirment.
Now I want to delete the last 50 pixels that I have not at all used to set their RGB values.

CPallini 13-Oct-10 4:55am

If the 'unused' pixels are sparse, then you cannot do much (you may, for instance, set them to black and rely on, already mentioned, lossless compression). If the most of the image pixels are 'unused' then you may code your own file format, saving just the info about the 'used' pixels.

Be Yourself 13-Oct-10 8:40am

Is there any method to recover the original bitmap pixel data after compressing the image to jpeg format.