Hi, I have shot RAW images worked on them and saved them as High resolution JPEGS. I would like to send a large number of these images to the subject, and want them to print ok to 5*7 size, but was wondering the best way of doing this - is it to save as a lower resolution JPEG or to resize using image processor (as I have already amended and cropped the files - this would be difficult). I am using CS4
You are addressing a number of issues that have no black and white answer as it depends on what they expect as a product.
I assume you want to send smaller file sizes to make it easier. Reducing the file resolultion will acomplish that, but it also reduces the quality of the end product. This image size in pixels (height and width in pixels) is your starting point and the higher it is the more leaway you have to reduce it and still have reasonable quality.
Your screen will only display 72 ppi (pixels per inch) resolultion, while a print is frequently 300 dpi (dots per inch). So it is difficult to see on the screen how the print will look. You just may have to run a few tests to see how x resolultion prints.
If you resize image it depends on whether you resample image or not. To see the inter-relationship between image size, file size, and pixel dimensions open an image in Photoshop and click on Image/image size. Change the document size and watch the numbers change with resample image on and off.
And filnally resizing to 5x7 usually means a crop in either height or width. Again look at document size and type in 5 for height and see what width would be without a crop.
Hope this helped rather than just adding confusion.