Adobe Photoshop - Images

[Fred Ridder]

The JPEG file format is not a good choice for screen shots, line
art, or images that include text. The image compression algorithm
used in JPEG is optimized for *photographic* images, which
statistically have few hard egdes or abrupt transitions between
contasting color regions, both of which are defining characteristics
of line art and screen shots. Because of the algorithm, JPEG
inherently produces artifacts (seen as a kind of "smudginess")
near hard edges. In a photograph, this smudginess is largely
masked by the surface texture of the object being photographed.
But in line art and screen shots, where there is no surface texture,
the smudginess is often glaringly apparent.

-Fred Ridder


>From: "Dori Green" <dgreen at associatedbrands.com>
>To: <techwr-l at lists.techwr-l.com>
>Subject: RE: Adobe Photoshop - Images
>Date: Thu, 23 Aug 2007 09:47:16 -0400
>
>Zen C wrote:
>
>I am trying to highlight a change in a
>screen (yup this is related with the release notes) and want to outline it
>with a circle (outline a changed field with a circle). How would I do that
>in Photoshop?
>
>**********************
>
>1.  Save file as a bitmap (.bmp).
>
>2.  Open in MS Paint.
>
>3.  Add callout circle (very easy and intuitive), save, close.
>
>4.  Open in Photoshop and save WITH NEW NAME as jpeg (.jpg) so you don't 
>overwrite your original file.
>
>The more complicated new tools become, the more pleased I am with the 
>simple old work-arounds.  If the power fails, here is where you can find an 
>old lady who can still lay out perfectly straight camera-ready copy with 
>rubber cement and a rolling ruler.  Oh wait -- if the power's out you won't 
>be able to do anything with that camera-ready copy.  Never mind.
>
>Dori Green
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