You should always select the lowest quality that is still suitable for your purpose. Or you might be asked to select a percentage from 0% (lowest quality) to 100% (highest quality). You might be given a number range, for example 0 (lowest quality) to 12 (highest quality). You might just see a few choices like: low, medium, high, or maximum. When you export to JPG from an image editing program, you’ll be prompted to select the quality level you want. It’s easiest to compress a JPG (also called JPEG) because there’s just one thing to consider: quality. For information about compressing PNGs or GIFs, please scroll down this page. We’ll take a look at how to get the best compression in each of the three file types starting with JPEGs. If you have a simple graphic with few colors and solid areas, then your best choice will be a GIF or PNG-8.

If a similar photo needs to have lossless compression or transparent areas, then a PNG-24 will be required.

If your image is a photo with lots of colors or an illustration with gradations and you want to squeeze the file size down, JPEG will probably be your best choice. The more compression, the smaller the file will be and the faster it will load on a webpage.īut first, you’ll need to decide which of the three file formats you want to use. In most image editing applications this is done by the selections you make in the “Save As” or “Export As” dialog box when saving a PNG, JPG, or GIF.

If you would like to give your untitled photos titles that include all or part of their filenames, you may find the Automator services & Applescripts in the Photos User Tips area useful.The primary way to reduce the file size of an image is by increasing the amount of compression. Titles are highly portable because they are stored inside the file according to various widely accepted standards (like Exif & IPTC) that all modern image apps understand. Filenames are a part of the file system that stores the file.īecause different file systems have different restrictions on what can be used as filenames, filenames are not necessarily 'portable,' meaning they may need to be changed when copying a file from one file system to another. If you change the displayed filename in iPhoto, you are actually giving the photo a title, not changing its filename. What may be confusing you is that if a photo has no title, iPhoto displays the filename instead. I used to just double click on the file name in IPhoto & retype the new name.

How to edit a jpeg on a mac