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Re: How to display graphics clearly on screen and on print?

Subject: Re: How to display graphics clearly on screen and on print?
From: "Fred Ridder" <docudoc -at- hotmail -dot- com>
To: edgar -dot- b -dot- dsouza -at- gmail -dot- com, Yvettedenoga -at- crimsonlogic -dot- com
Date: Tue, 08 Aug 2006 16:55:54 -0400

On 8/8/06, Edgar D' Souza wrote (in part):


Depending on the level of detail/quality you want in your images, you
probably ought to pick between JPG or PNG formats for your screenshots.

I have to respectfully disagree with Edgar's recommendation to use
JPG (or JPEG) format for screen shots.

And I have to wholeheartedly agree with Lou Quillo's statement:
"JPEG is designed for photos (and images *very much like* photos).
That's the only time to use it."

What is meant by "photos and images very much like photos" is
images that have gradual transitions between areas of different
colors or shades. JPEG is particularly ill-suited for screen shots, line
art, or any image containing a significant amount of text because
it's image processing algorithm is optimized for gradual transitions.
If you look closely at a JPEG image that contains abrupt color
transtions (like text) you'll see noticeable "smudginess" near
those transitions, which are artifacts produced by the JPEG
image processing algorithm. Let me repeat that: artifacts
*produced*by*JPEG*. When I visit a website or look at a print
advertisement from a merchant who scans the labels of some
of the products they sell (I'm thinking of wine labels, but that's
just because I'm a wine enthusiast...), I can spot a JPEG scan
at 10 paces because it's all smudgy and often unreadable. If
they had scanned the image as PNG (or TIFF or GIF or even BMP)
that smudginess wouldn't exist.

My opinions only; I don't speak for Intel.
Fred Ridder
Intel
Parsippany, NJ

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