Solution suggested by PECourtejoie.
Issue: When you try to crop an image in Photoshop and enter width, height and resolution values in the crop options, you receive the error that the scratch disk is full and are unable to crop the image.
Details: If you leave the crop options blank, you can crop the image successfully. This usually occurs because you left a resolution target in the options for the crop tool and it is attempting to resample your image to something bigger than your scratch disk can hold
Solutions: Do one of the following:
Solution 1: Clear the crop tool options.
Click the Clear button on the crop tool options bar to remove previously entered measurements and the target resolution.
Solution 2: Specify measurement units when cropping.
Enter the desired measurement units in the width and height crop options. For example, enter 100px for pixels, or 1in for inches. Remove any text from the resolution field.
Solution 3: Set the default measurement units.
To set the default measurement units:
1. Choose Edit > Preferences > Units & Rulers (Windows) or Photoshop > Preferences > Units & Rulers (Mac OS).
2. Select a measurement unit for Type under the Units section of the Preferences dialog box. For example, select Pixels.
3. Click OK.
Message was edited by: PECourtejoie