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mondu5
Posts: 2
Joined: 9/30/2005
Status: offline
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JPEG - 9/30/2005 3:48:00
Hi, I'm new here, I know this has been asked before, but for some reason I can't find the question again nor find the answer to it. So I have to irritate everyone and ask again.
I have always been able to save pictures as jpeg, now when I save a picture it is BMT untitled. I know already been discussed, but could someone help me? Thanks
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rdouglass
Posts: 9280
From: Biddeford, ME USA
Status: offline
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RE: JPEG - 10/5/2005 15:57:21
.or could it be .BMP?
My general solution for that is to copy and paste it into Paint and then Save As... JPG.
at least that's one way.
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cfdtv1
Posts: 13
Joined: 3/9/2005
Status: offline
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RE: JPEG - 11/13/2005 23:14:44
doesn't saving/converting files like that cause the image to degrade? Isn't that also inherent with .jpg files? And since I've asked that....How do you decide wether to save an image as .jpg or as a .gif? Size of the file can't be the only reason.
Please enlighten me.
Thanks
Gary
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Kitka
Posts: 2520
Joined: 1/31/2002
From: Australia
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RE: JPEG - 11/14/2005 3:38:57
IF it is .bmp that is the only format offered, the traditional fix is to empty your browser cache. For IE: Tools > Internet Options > General tab > Delete files
Close the browser, then reopen and try again.
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Kitka
**It is impossible to make anything foolproof because fools are so ingenious.**
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d a v e
Posts: 4199
Joined: 7/24/2002
From: England (but live in Finland now)
Status: offline
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RE: JPEG - 11/14/2005 11:42:12
Gary - certainly saving a jpeg from a jpeg will degrade the image further - though how noticeable it is depends on how much further you compress it and how much information had been taken out in the first place. for this reason you shuld always work with the original image in a lossless (i.e. uncompressed) format (e.g. an application's native format such as psd, psp, [fireworks]png...) or as a tif, bmp...
photos and images with gradients/more than 256 colours should be saved as jpegs and everything else (logos, most buttons, clipart etc) should be saved as gifs or 8-bit png (similar to gifs but a bit smaller)
jpegs work by throwing away some information, in the areas that you don't really notice and in images that are photographic/gradients you don't really notice untill you compress them really harshly. (images with large areas of blue - for england read grey - sky will soon start to show artefacts of jpeg compression i.e. blotches of strange colours in the sky as too much information is lost and it becomes more noticable in larger areas of similar colours)
gifs work a little bit like winzip by looking for areas of contiguous colours (e.g. a a red rectangle in a logo or a button background) and instead of remembering a row of 15 red pxiels as a red pixel, then another red pixel, then another red.... it instead remembers 15x1 red pixel (LZW compression)
the 'grey' area comes when you have (fairly plain) text and gradient/photographic backgrounds or text with a drop shadow. gif would be the best format for the text yet the gradients or drop shadow would require the thousands/millions of colours afforded by jpegs, rather than the maximum 256 of a gif. some editors allow text/edge sharpening for jpegs (e.g. macromedia fireworks) so that text is still fairly crisp on photographic backghrounds and the like. on the other hand gifs/8-bit pngs can be used with some careful use of dithering (mixing of adjecent colours to replicate one 'missing' colour: (think e.g. lots of red and yellow pixels in a checkerboard grid that merge to look more or less orange).
as for how far to compress it depends on how sharp the image needs to look (is a thumbnail or an important site header?) and a slight softening of the image will aid the compression even more, allowing for a smaller file size. i usually compress the image in preview from a high quality to a medium one until i see the image start to become unacceptable and then back up a couple of notches.
it's always better to save or export your images in a dedicated image application rather than frontpage or dreamweaver 8 - and remember if you resize it use some sharpening afterwards (often called unsharp mask in psp/PS/fireworks, et al)
anyways i've rambled on enough hope that anwers your question! if you have any more just ask ;)
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David Prescott
Gekko web design
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d a v e
Posts: 4199
Joined: 7/24/2002
From: England (but live in Finland now)
Status: offline
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RE: JPEG - 11/14/2005 23:56:53
quote:
Good summary Dave!
good job it wasn't the full explanation ;)
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David Prescott
Gekko web design
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Printable Version 
Good summary Dave!
WOW! Thanks Dave, that was more than I could have ever hoped for. I will print and save that for further use. 
