I hope this is a good enough explanation in laymans terms. An image is made up of a certain number of pixels. When an image is made larger (more pixels added), extra pixels are inserted between two adjacent ones (ones that were adjacent in the original). When one pixel is added between two adjacent ones, it would generally be the average of those two pixels. Obviously if you add more than one pixel at a time (say two or three), then they will all be the average of the original two adjacent ones, and so the quality of the image will deteriorate. Stair interpolation is simply an automated method of increasing the number of pixels in an image in tiny amounts to get the best out of an image. Phew.
I use both Genuine Fractals and Fred’s plugins. They are all very good. I wouldn’t hesitate in recommending them, although if you are already happy with the resolution (and size) of your printouts now, then you needn’t bother.
Hope that clears things up a bit.
Stew.
"mxh" wrote in message
"Peter Booth" wrote in message
Look under Image/Image size and have a play around in there . I can see
no
possible reason to use stair interpolation as this is used to increase definition in an image that is lacking in content .
Thanks for responding. I’m familiar with the image size command and have often availed myself of it. The SI plug-in is supposed to be an action
which
changes image size in steps. It somehow is supposed to maintain the integrity of the image in doing so. I was hoping someone in here had some experience with it.
Thanks,
mxh
I see that Fred Miranda has an action for sale called "Stair Interpolation plug-in" for digital cameras. My Fuji FinePix 6900
puts
out 6mp images and the initial pixels are 2832 x 2128 with a "print size" of 39.333" x 29.556" at a resolution (DPI?) of 72. Being that the print size is so large, would Fred’s SI plug-in be of any use to me? Is it for reducing image size as well as enlarging?
Also, I’m obviously a novice at image printing. Can someone point me to a good source of information regarding printing photos from PhotoShop?
Thanks,
mxh