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how can i change a bmp file from 200X200 dpi to 209X196dpi

Posted on 2003-02-23
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Last Modified: 2008-01-16
i do konw how to change this dpi! in photoshop,the dpi which can be changed is 300X300 and 200X200,but it cann't
be 209X196,how can i do? i want to in c language write it,
everyone can help me?
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Question by:maladon
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8 Comments
 

Author Comment

by:maladon
ID: 8005931
how can i change a bmp file from 200X200 dpi to 209X196dpi
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Expert Comment

by:akshayxx
ID: 8006099
do you have any background on Digital Image processing.
if no . then get hold of some book on digital image processing .. and see how to 'zoom'.. then in ur particular case .. u will have different X and Y zoom factors..
read the  zooming concept . after that  only thing left will be read the image file into pixel matrix .. and do some 'zoomin' mathemetical formula on the image pixels
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Expert Comment

by:akshayxx
ID: 8006108
sorry i thought u wanted to change the scale of the image ..

u want to change DPI ..am i right now?.. well thats once again Image Processing ..
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Accepted Solution

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akshayxx earned 150 total points
ID: 8006152
actually i dont think changing the DPI(dots per square inch) will have any effect on image data .. DPI is meant for printing purposes..
so i guess what u mean is change the size .. right ?????
if yes then follow my first comment
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Expert Comment

by:Rapture273
ID: 8009922
There is a free utility you can download called Infranview that will do a lot with graphics. I'm not totally sure, but you may be able to change the dpi in this. It may help us answer your question if we knew why you wanted to change the dpi. There may be other options to solve your problem.
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Expert Comment

by:akshayxx
ID: 8013331
if u looking for free imaging software .. nothing beats GIMP.. gimp in imaging world is what linux is in OS world..
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Author Comment

by:maladon
ID: 8031019
thinks for akshayxx and Rapture273 !
i think akshayxx is right!
i change the size of bmp file according to dpi,i had get actual result!
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Author Comment

by:maladon
ID: 8031030
thanks!
my friends!
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