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How to compress your images with Adobe Photoshop

Photoshop - Image Compression

Photoshop Save for Web MenuWritten by: Bryan Tor
Updates provided by:
Last Updated: November 2019
Contents:

Save to Web

Selecting Save for Web from Menu Bar

Select the Save for Web (Legacy)... option under File then Export.

Depending on which optimized file format you select, there are several options available on how you want to best save your image for the web. We recommend you use either a JPEG or GIF format. Read more about Optimized File Formats for the Web here.

IMAGE SIZE

Reducing your image size will reduce the overall file size.  The image below shows a width of 3000 pixels and a height of 2000 pixels.  For web images, typically an image that has the longest edge at 1000 pixels will be large enough for your purposes.  If the chain link is linked, both width and height will remain in the same aspect ratio when you change the other.

JPEG COMPRESSION

If you selected a JPEG Optimized File Format, then you can select a Compression Quality option.

GIF OPTIMIZATION

If you selected a GIF Optimized File Format, then you can select a Color Reduction Algorithm, Dither Algorithm, and other options. We recommend that you stick with the default options, but you can read more about Optimizing GIF Files here.

Photoshop Save for Web Menu

Export As

Selectiong "Export As..." from Menu Bar
Select the Export As... option under File then Export.

In the export menu, set your Format as JPG. You can modify the Quality of the image. A lower quality will have a smaller file size.

If you are uploading to an Omeka site, you will need to get your file size to 2mb or smaller.
Menu for Exporting Images Photoshop