Ugly Woodgrain Patterns On Pictures

I
Posted By
info
Nov 12, 2003
Views
630
Replies
6
Status
Closed
When I open my pictures in the Windows Picture And Fax Viewer they look crystal clear and print crystal clear as well. But when I open them in Photoshop, or another program called Photo Impression, they have ugly woodgrain looking patterns on them and they print like that as well. Anyone know the cause and what can be done?
Any help is greatly appreciated.

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D
Dave
Nov 13, 2003
"lynn" wrote in message
When I open my pictures in the Windows Picture And Fax Viewer they look crystal clear and print crystal clear as well. But when I open them in Photoshop, or another program called Photo Impression, they have ugly woodgrain looking patterns on them and they print like that as well. Anyone know the cause and what can be done?
Any help is greatly appreciated.

Sounds like JPEG artifacts to me.

David
W
westin*nospam
Nov 13, 2003
"Dave" writes:

"lynn" wrote in message
When I open my pictures in the Windows Picture And Fax Viewer they look crystal clear and print crystal clear as well. But when I open them in Photoshop, or another program called Photo Impression, they have ugly woodgrain looking patterns on them and they print like that as well. Anyone know the cause and what can be done?
Any help is greatly appreciated.

Sounds like JPEG artifacts to me.

Doesn’t sound like it to me. But we’re both trying to imagine something we haven’t seen. Lynn, can you post an example to the Web?


-Stephen H. Westin
Any information or opinions in this message are mine: they do not represent the position of Cornell University or any of its sponsors.
J
JJS
Nov 13, 2003
"lynn" wrote in message
When I open my pictures in the Windows Picture And Fax Viewer they look crystal clear and print crystal clear as well. But when I open them in Photoshop, or another program called Photo Impression, they have ugly woodgrain looking patterns on them and they print like that as well. Anyone know the cause and what can be done?
Any help is greatly appreciated.

Sounds like GIF dithering – too many colors in the image to manage with the limited pallet. Post the image somewhere.
T
tacitr
Nov 13, 2003
Sounds like JPEG artifacts to me.

Nope, that’d be something else.

The original poster specifically mentioned FAX software. I believe he is opening 1-bit bitmap FAX images. If you take a complex bitmap image and reduce it in size on your screen by zooming out, the image will display a moire pattern. Depending on the image, this moire pattern can be swirly loops, which look vaguely like wood grain.

The solution is simple. Do not zoom out. Look at the image at 100% magnification.


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D
david
Nov 14, 2003
Except they said it prints that way too. That has got to be more than just changing the zoom factor on the screen.

"Tacit" wrote in message
Sounds like JPEG artifacts to me.

Nope, that’d be something else.

The original poster specifically mentioned FAX software. I believe he is opening 1-bit bitmap FAX images. If you take a complex bitmap image and
reduce
it in size on your screen by zooming out, the image will display a moire pattern. Depending on the image, this moire pattern can be swirly loops,
which
look vaguely like wood grain.

The solution is simple. Do not zoom out. Look at the image at 100% magnification.


Rude T-shirts for a rude age: http://www.villaintees.com Art, literature, shareware, polyamory, kink, and more:
http://www.xeromag.com/franklin.html
T
tacitr
Nov 14, 2003
Except they said it prints that way too. That has got to be more than just changing the zoom factor on the screen.

A 1-bit bitmap may exhibit undesireable moire if it’s printed at a resolution that does not scale to the resolution of the printer, or if it’s printed at a reduced size. Still, it shouldn’t be as bad as the on-screen display.


Rude T-shirts for a rude age: http://www.villaintees.com Art, literature, shareware, polyamory, kink, and more:
http://www.xeromag.com/franklin.html

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