Because “Resample Image” is unchecked, there are only 500 pixels for width & 357 pixels for height. In the above figure any attempt to get a 5×7 print results in lower resolution. Notice how the image went from being a 5×7 print to less than two inches in size. The integrity of the image does not change because the pixel count stays the same. Adjusting resolution will simply increase or decrease the size of an individual pixel. When “Resample Image” is unchecked notice how the Pixel Dimensions become locked.
No Resampling Means Image Integrity is Maintained. Once that’s set, then I move to the appropriate width & height field for outputting my image. Whenever I size an image, I always set the resolution field first. Resampling changes the pixel dimensions and total pixel count. If you look closely you can see that the resolution of the image (300) multiplied by the height in inches (5) gives us a requirement of 1500 pixels to print. When “Resample Image” is checked, changing values in any field effects the entire dialogue. Resampling Changes All Field Values (Resolution x Size = Pixel Dimensions) Document Size is necessary when outputting an image for print. Pixel Dimensions are used to size an image for a display, e.g., monitor, overhead projector, television. Notice the two distinct areas for sizing an image – Pixel Dimensions and Document Size.
Pixel Dimension for Screen / Document Size for Print First thing is to get to the Image Size command: Press CMD+OPT+I (CTRL+ALT+I) to open the Image Size dialogue or choose Image->Image Size from the Photoshop menu. Often overlooked, sometimes confusing, easily dismissed, but oh so important. I’m not one to mince words, so let’s jump right into this morning’s lesson. As originally posted on Tip Squirrel July 2009.
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