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RE: Rules for reducing graphic dimensions without pixelation
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_gail
Posts: 2876
From: So FL
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RE: Rules for reducing graphic dimensions without pixel... - 11/15/2004 13:51:20
quote:
From what I've read here I feel I may be stating the obvious to you as it appears you are well up on your graphics so apologies if thats the case. It will hopefully be useful for others.
Ooooh, no. As already stated, I've learned a lot from you...and others. This thread is definitely going to be bookmarked by me.
My main hope, though, is that spinningjennie finds the information understandable and can apply enough of it to address the problem stated in the first post. If not, ask away.
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_gail
Posts: 2876
From: So FL
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RE: Rules for reducing graphic dimensions without pixel... - 11/16/2004 8:50:16
quote:
HOWEVER, Photoshop probably has something similar to what Paintshop Pro has called resampling. In PSP, when I resize an image, I have several choices of resampling methods. Each method produces different results. Bicubic is best for enlarging; bilinear is best for making smaller; sometimes smartsize is better...
I read a photography magazine last evening which addressed some of these issues. What I didn't realize before reading it is that not all image editing programs offer the same resampling choices. Some photo editing programs don't offer Bicubic at all. This, along with other factors of course, may account for our varied experiences with resizing jpegs and the resulting quality.
Photoshop 7 offers three interpolation/resampling methods (I think they added two more in CS). The are defined by Adobe as:
Nearest Neighbor (Jagged) - the fast but less precise method. This method is recommended for use with illustrations containing non-anti-aliased edges, to preserve hard edges and produce a smaller file. However, this method can result in jagged effects, which become apparent when distorting or scaling an image or performing multiple manipulations on a selection.
(Photoshop) Bilinear - medium-quality method.
Bicubic (Smooth) - slow but more precise method, resulting in the smoothest tonal gradations.
gail
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Nigel
Posts: 382
Joined: 7/24/2002
From: Wirral - UK
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RE: Rules for reducing graphic dimensions without pixel... - 11/16/2004 16:27:11
This discussion brings to mind the expression:
"Theres more than one way to skin a cat"
An odd expression though - anyone know it's origins.
A lot of the images I use are from my own originals and it's not unusual for my clients to want to use some of the images in brochures or other publications. It one of the reasons why I keep non lossy originals. I probably wouldn't if they were only for web use.
Shooting in Raw mode gives the best options for editing but perhaps thats for another thread.
I also hope spinningjennie found it useful - it's easy to lose site of the original reason for the discussion - thanks for the reminder.
Nigel
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