My question is based on some booklets that we have created in the past. We have some very large images all 300 ppi, but when shrunk down they tend to have an effective ppi of 500 or greater. Part of me feels that when the effective dpi is large, that I should go back into photoshop and resize those images, hopefully saving the size of the PDF file after exporting. So, my questions are one, does anyone even resize images anymore to fit the rectangle frame to keep ppi around 300 or two, do they not do this anymore and let InDesign handle this process when exporting to PDF?
Better quality is to resize in Photoshop and sharpen there, because InDesign has no choice of the method of sharpening. But to be honest, in the majority o cases I do resampling in InDesign when exporting to PDF.
I tend to resize in Photoshop only for the more persnickety jobs.