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OK I've been following this thread for the most part and it seems to me that a major consideration for re-sizing captures is being ignored here: Screen display size and output size are not interdependent, i.e., you can have and image appear 640 x 480 pixels on screen but out put at 50% or 400% of its size without any noticeable loss of clarity.
You should never have an issue with blurred images when going to print as you can specify output size independent of screen display size and prevent the image from being re-sampled.
I routinely use tiff for my screen caps (I use Quirk for DTP and it seems happiest with tiffs). As I layout my pages I check to see about what size my image should be (sometimes even using my old proportional scale), then set the document (output) size in Photoshop, being sure to uncheck the re-sample image option. And, Viola, perfectly legible screen caps at any size.
I've got PDF proof of this technique if anyone is interested.
>>The perils of using screen captures become evident when the deliverables are
in PDF. Screen captures look horrible at the wrong resolution, and it
doesn't take much for a GUI to be too big for the page at the "correct"
resolution. Sometimes for the sake of look-and-feel an entire GUI window
must be inserted without cropping, but when it comes to specific features,
go ahead and crop.
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