It's been suggested by some folks on the PS list, by Adobe, and at least a couple of PS training experts, that Bicubic Sharper is the preferred method to use when reducing file size. Bicubic smoother is suggested for making a file larger. My results have been mixed with Bicubic Sharper. Sometimes the sharpening seems to be a bit too much. The success of the approach seems to depend on the image. The best approach may be plain vanilla Bicubic with sharpening done after reduction, either globally or locally using the luminance channel and USM, or with other sharpening techniques.
One method suggested last night by a PS expert on the PS list is to dupe the file and then use Bicubic Sharper on one and Bicubic on the other. Having got the two documents to the same size, drag one into the other while holding down the Shift key and then reduce the opacity of the 'oversharpened' layer. That gives a nice degree of control since one can't control the result when using Bicubic Sharper. The same technique may work when interpolating upwards using Bicubic Smoother, although I've not tried that myself. Shel > [Original Message] > From: Paul Stenquist <[EMAIL PROTECTED]> > Some people on the digital darkroom forum have experimented with this > and found that doing it in one step is superior to a lot of small > steps. Make sure your PS preference for file size changes is set to > "Bicubic Smoother." That appears to be the best choice in most cases. > (That's probably more important for increasing file size.)
