The finer the detail, the less the compression. For example, a x pixel bit color image 3 bytes per pixel requires 9. Check Resample Image if you want to change the pixel count-- to resize the image.
If the image has been saved with compression then you notice that the save image has a much smaller file size than what it was when it was open.
You may then crop the image to reduce the file size, or use interpolation to increase the file size.
Therefore quantity helps, but also the size and depth of each pixel determine the quality. The more important the image, the more you need to think this out. Irfanview is a great free utility that can read and write image files in almost any format.
To summarise, thinking early on about making a file of a size that is easy to transmit and convenient for the recipient can save lots of people lots of time and storage later on. The best solution is to do the scan again at the correct size. But each copy is made up of a different number of pixels which just expand in size to fit the image size.
Figure 13 The image opened in Photoshop A much easier way is to simply open the image in Photoshop The Width and Height attributes are ignored.