On Wed, 24 Jan 2007 22:31:37 -0400, Papa Joe <Sorry> wrote:
Any professional digital photographer that sends JPG to any sort of Ad Agency or design firm for color correction and then print on Magazine, billboard or litho press jobs, should be shot and hung. We need way more information to edit the photos and manipulate them than to print them with decent results. Look at your histogram in photoshop and see for yourself. It’s called combing and JPG is by far inferior to TIF or raw. The JPG compression strips out pixels… even at 10 setting (max). It destroys valuable information for proper color correcting and must be stopped!!!
JPG should be used only for family portrait studios and amateurs that can’t afford space, but in the pro world, JPG is shunned. Very much disliked and you will lose respect among the adverstising world.
Well unless you were using lossless JPG encoding. Here’s a neat lil comparison:
http://www.backwater-productions.net/_adg/Image_Format_Compa rison/ The base image is a palette based graphic with 30 colors. I’m using Paint Shop Pro 9 for the file saving (using other
tools/techniques/encoding schemes/etc it’s possible to get slightly lower file sizes, but the general differences between them will remain the same).
As far as overall compression whilst maintaining the truest level of color and detail to the original…PNG comes out on top at a mere 768 bytes. GIF comes in second at 1.48 kilobytes. TIFF is third at 2.82 kilobytes.
And, as expected, JPG comes in DEAD LAST:
http://www.backwater-productions.net/_adg/Image_Format_Compa rison/Image_Test_-_JPG_No_Compression.jpg Using ZERO COMPRESSION it gives us a file size of 5.47 kilobytes and COMPLETELY DESTROYS THE COLOR QUALITY:
http://www.backwater-productions.net/_adg/Image_Format_Compa rison/Destroyed_Color.png It turns a SINGLE COLORED background into FIFTY ONE DIFFERENT COLORS…and the ORIGINAL COLOR…it’s NOT EVEN ONE OF THEM! o_O
Obviously this effect is MUCH easier to see on palette based images, but just try and image the level of original color destruction that’s taking place on a photographic image even when using NO COMPRESSION.
Like the last poster said…if yer using JPEG, even at no compression (not including lossless encoding) yer pretty much a dribbling amateur who doesn’t know what he/she’s doing.
PNG overall I feel is the best option, it achieves a significantly higher level of compression over TIF with true color images, it supports palette based encoding which allows you HUGE levels of compression on palette based images. It also supports single color and alpha transparencies. And it’s very much web friendly (where as TIF is just…well it’s not). The only thing TIF really has going for it is CMYK color preservation…but then at that point why not just use teh PS or PSP format and then you get all sorts of extras like layer saving?
—
Onideus Mad Hatter
mhm ¹ x ¹
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