Adjust image size and quality
When adding an image to an object file, in the Image import window:
- If the checkbox labelled Make no changes to the image is checked, click it to enable the image processing tools. *
- The Resolution scale setting lowers the resolution of the image, in effect decreasing the number of pixels used to describe it. This makes the image take up less working memory and disk space, but can also make the image appear more blurry when viewed up close or on printouts. In the box labelled Details you can see the exact size and also the memory consumption (weight). The Approximate print resolutions box shows the print resolution of the image if it were to be printed over an entire page and can be used as a guide when choosing an appropriate Resolution scale.
- A way in which to control the memory consumption (weight) but not the image resolution is to adjust the JPEG quality setting. But setting the quality too low will result in disturbing visual artefacts.
* Images in object files are always stored with JPEG compression. When adding an image file which is already in a JPEG format, the default behaviour is to keep the image data intact, preserving the image quality. If any changes are made to the image then it has to be recompressed. Unchecking the Make no changes to the image checkbox enables recompression as per the JPEG quality setting, and enables all the image processing tools. PNG and TIFF files are always recompressed.