If I save a picture as a BMP it used more space than the same picture if I save it in JPEG. Why is that? Does the BMP have a lot better resolution or what? I just looked at the same picture saved as a BMP and it's 1.3MB; the JPEG of the same picture is 553KB.
2006-07-26 10:07:53 · 9 answers · asked by Im2hard2please 2 in Computers & Internet ➔ Software
JPEG files have compression built in to make the image filesize smaller, this means you get smaller images but the trade off is a loss of quality. Bitmaps are exact copies of the image so there's no quality loss, but it makes for whopping big files as you've found. The JPEG compression algorithim is very good though so most of the time you won't really be able to see any difference just by looking at it.
There's a load more details about JPEGs and how they work here:
http://en.wikipedia.org/wiki/Jpeg
2006-07-26 10:11:53 · answer #1 · answered by Bamba 5 · 0⤊ 0⤋
BMP has a higher resolution than JPEG
You might not notice for your picture, but with some pictures that you save from BMP to JPEG, the quality of the picture declines in order to save space.
2006-07-26 17:11:19 · answer #2 · answered by mommy_mommy_crappypants 4 · 0⤊ 0⤋
The bmp has much higher resolution. Jpeg is a compressed format designed to make the file smaller.
2006-07-26 17:09:58 · answer #3 · answered by MrPurrfect 5 · 0⤊ 0⤋
both have compression algorithms, and JPEG is smaller. Plus, how did you convert them? Did you degrade the quality when saving to JPEG or did you save at 100% quality?
If you lowered the quality in any way, that would be the answer to your question.
PS. resolution, quality, and compression are usually not the same thing, but lowering the first two or increasing the third will lower the file size. And the resolution should not change if all you did was convert the format. (Resolution is size of the image in pixels)
2006-07-26 17:17:53 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Because BMP does not use compression; JPEG does.
2006-07-26 17:56:28 · answer #5 · answered by NC 7 · 0⤊ 0⤋
JPEG is a compressed format of a picture. It's like comparing the size of a WAV file to a MP3 file. MP# is a compressed version of a WAV file.
2006-07-26 17:10:30 · answer #6 · answered by Glenn N 5 · 0⤊ 0⤋
Now take all of the above and think of it like this: I you take a picture of a wall. Many of the pixels have exactly the same color.
In a non-compressed format, each pixel has a color code--millions of pixels.
In a compressed, there is an algorithm that 'groups' a range of pixels to a color code. Obviously, this method would take up less room to store.
2006-07-27 00:03:35 · answer #7 · answered by williamh772 5 · 0⤊ 0⤋
The reason why bitmap uses more space is because it's uncompressed unlike jpeg....
jpeg uses compression.
2006-07-26 17:09:36 · answer #8 · answered by HotRod 5 · 0⤊ 0⤋
there is a better resolution on the bmp file right? so obviously the bmp file would have more to it than a basic jpeg, duh
2006-07-26 17:10:52 · answer #9 · answered by aaron 2 · 0⤊ 0⤋