I have Photoshop LE, but wouldn't just be easier to go into 'Image Size'
and then uncheck the box labeled 'Resample Image', and then change the
size? Sure you might end up with some odd DPI, but there shouldn't be any
interpolation.
Todd
At 08:19 AM 8/4/01 -0400, you wrote:
>If your original scan includes a sufficient number of pixels, you can
>resize in Photoshop without interpolation. (In the following examples,
>I'm going to use made up numbers to illustrate the point, so all of you
>mathematicians put your pencils away, because the numbers won't
>calculate out exactly. )
>What you must do is change the dpi as you change the dimensions of the
>picture. For example, if I scan a neg to approximately 8 inch x 12 inch
>dimensions at around 400 dpi, I can change it to 10 x 15 at about 300
>dpi without altering the image. It's easy to see when Photoshop is not
>interpolating when using the "Image Size" tool by keeping an eye on the
>megabyte value at the top of the box. When, after choosing the
>dimensions of your blowup, the box shows two megabyte values at the top
>of the frame, you know the software is interpolating, EVEN IF THE VALUES
>ARE THE SAME. At that point, you can just fool with the decimal places
>in your resized photo until one of the megabyte values at the topof the
>box disappears. That's Photoshop's way of telling you that it's not
>going to fool with your pixels. For example, if you go from 12.13 inch
>by 8.07 inch at 405 dpi to 15 x 10 at 324 dpi, you might get see
>something like "56.5 M 56.5 M" at the top of the box. That means your
>new sizing is close to the same but not exact enough. At this point, I
>would start adding decimal places to the dimension value on the resized
>picture. For example. I might try 15.1 inch, but that would probably be
>too much (since I'm already at the same megabyte count. If I was at 56.4
>meg it might be a good starting point). If it bumped my megabyte count
>up to 56.6, I'd try 15.05. If that resulted in the second megabyte
>dimension remaining the same, I'd add more decimals, 15.051. If that
>didn't cause the second value to disappear, I'd try 15.052, then 15.053.
>At some point, the second megabyte value at the top of the box will
>disappear, and I'd be left with a single "56.5 M" value. I would then
>know that my original scan and my resized pic had exactly the same
>number of pixels, which means that to the computer, they're identical
>and there is no need to interpolate. This may sound confusing, but it's
>quite easy in practice. I'm no Photoshop expert and their may very well
>be an easier way to do this than "guess and check," but it works for me.
>Paul Stenquist
>
>
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