Reduce an image for on-screen display and to optimize file size.
Enlarge an image to specific dimensions in preparation for printing.
Select from a variety of interpolation methods (see note below).
Maintain the image's aspect ratio or resize unconstrained.
When you resample an image, you have the option to: This will also decrease the image's file size.
Decrease the number of pixels in an image (i.e compress it) to make its overall pixel dimensions smaller.
This will also increase the image's file size.
Increase the number of pixels in an image (i.e stretch it) to make its overall pixel dimensions bigger.
The image's pixel dimensions remain unaffected. Scaling will embed a specific print resolution into an image's metadata to force it to print at a specific dpi (e.g. These can be undertaken independently or simultaneously. You can change the 'size' of an image by scaling or resampling it. Acrobat Pro/DC and others.In Affinity Photo there are options to change a document's or image's pixel dimensions and/or print resolution. There are commercially sold third-party tools that extract bitmap images from PDFs without resampling them, e.g. I can't say what it does to the exported image if you put in a ppi value different from the actual ppi value of the embedded image. The export dialog will ask for a pixel density (in ppi) to use for the export, as it is assumed that you are converting vector graphics/text to bitmap graphics…Īnother possibility is to use the marquee/selection tool to select an area or the whole page and press Cmd-C, then create a new Preview document from the selected area by pressing Cmd-N, and save the new document in a bitmap format. However, if you have a PDF file that contains only embedded bitmap images, and you want a downsized version of that image, it's possible to use the Preview's export feature: File > Export. Usually you don't want to change the format of a PDF document, anyway. The Adjust Size / Colour feature in Preview doesn't work for PDF files, only for bitmap image files.
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