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quote:
Originally posted by DJKAL
thanks both of you, il give her that link later
quote:
Originally posted by CookieRevised
PS: please do not save screenshots as BMP files! Save them as GIF, JPG or PNG, but not BMP.
ok. no problem il remember, but just wondering why, not meaning to be cheeky and i will do it.
nah, you're not cheeky (though the reasons can be found in various threads on this forum too
)...
anyways, the reason is because BMP files store the image data uncompressed. This means that an 100x100 image will be at least 100 x 100 bytes big, and if you consider 24bit images that's even 3 x 100 x 100 bytes. This is very huge compared to GIF, PNG or JPG which compress images considerably.
eg: the image you posted in this thread is 437KB big, that's very huge for an image which would have been only 12KB when saved as a PNG
(without any quality loss) and only 7KB when saved as a GIF
(with colors reduced to 256 colors). And that is even without cropping the image and removing the useless white space beneath it.
Somebody using a modem would need to wait almost 2 minutes before that 437KB big image is fully loaded! Whereas if you saved it as a GIF he would only had to wait less than 2 seconds. (Not to mention the difference in bandwidth usage and the bigger chance of possible errors in bigger images/data).
Also, another fact is that BMP is not a widely supported image type for images on the net. Again only GIF, JPG and PNG are supported.
(though MSIE doesn't fully support the alpha-channel in PNG's with alpha-transparancy).
BMP should never be used for anything. If you need a lossless (=without reducing quality) graphics format which can use 24bit colors, use PNG.
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Why not BMP?
