When you resize and resample an image, you change the amount of data in that file. To resample your image, ensure increase image size in kb that Resample is selected at the bottom of the Image Size dialog. Resample is on by default.
Resampling changes the total number of pixels in the image, which are displayed as Width and Height in pixels in the Image Size dialog. When you increase the number of pixels in this part of the dialog box (upsampling), the application adds data to the image. When you decrease the number of pixels (downsampling), the application removes data. Whenever data is removed from or added to the image, the image quality degrades to some extent. Removal of data from an image is typically preferable to the addition of data. That’s because upsampling requires that Photoshop guess which pixels to add. This procedure is more complex than guessing which pixels to remove when you downsample. You get the best results working with images you bring into Photoshop in the proper resolution for the output you want. You could get the results you need by resizing your image without resampling. However, if you resample your images, do so only once.
When you turn on Resample, you can change any of the values in the Image Size dialog: pixel dimensions, physical size, or resolution. If you change one value, you affect the others. The pixel dimensions are always affected.
Changing the pixel dimensions affects the physical size but not the resolution.
Changing the resolution affects the pixel dimensions but not the physical size.
Changing the physical size affects the pixel dimensions but not the resolution.
You cannot set the file size; it changes when you change the total amount of data in the image (the pixel dimensions). Note the file size value before you change the other values in the dialog box. Then, you can use the file size information to understand how much data is removed or added to your image when you resample it. For example, if the file size changes from 250 KB to 500 KB, you add twice as much data to the image, which can degrade it. Degraded images can look blurry, jagged, or blocky.
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