how do i change the pixel size of a jpeg picture?
2. Find the Menu option for editing the photo's size. Decide whether you want to resize the JPEG picture by Pixel Dimensions or by Document Size.. Choose Pixel Dimensions if you want to upload the photo to the web or email it; edit by Document Size if you want to print the picture.1  6 Edit step.f you have ever tried to send a large number of JPEG photos via email or upload them to an online photo album, you have probably noticed that the large sizes of these files can cause problems with emails that are too large to send and files that take a long time to upload.