This means that if you want to save a file at, say, exactly 300 pixels wide, there will be necessarily some hit-and-miss approximation before you hit on the right percentage: The Photoshop plugin currently allows users to specify the size of the resulting image as a percentage, rather than in pixel dimensions. This costs $50, and means you can bypass the web process to export as many images as you want at no extra cost. If you’re using Photoshop CS5, CS6 or even Photoshop CC, you can buy the TinyPNG plug-in that will allow you to export 8-bit PNG images directly. If you’re going to want to process more images than this you can upgrade to a paid account, for which you’re charged just under a cent for each of the next 500 images, and one fifth of a cent after 10,000 images. You’re can process up to 500 free conversions a month, but bear in mind that each size you choose counts as an additional conversion. The plug-in allows you to output a variety of image sizes, and you can select those you want to create. This takes a few extra seconds, but results in dramatically reduced file sizes. This can be set to process images either as they’re imported into the site, or in the background (although this can result in issues with other image plug-ins). In this example, the 24-bit shopping cart image weighed in at 172.8k for a 300-pixel image after processing by TinyPNG, that size came down to just 41k, with no discernible loss in quality:Īs well as using the free web service, you can choose to install the WordPress plug-in. Drag a 24-bit PNG file into the site and, in a couple of seconds, it will return an 8-bit version, but with a full 8-bit alpha channel. TinyPNG () offers a solution to this problem. Here’s an example of a 16-bit and an 8-bit PNG side by side, exported via Photoshop’s Save for Web dialog, in which you can see that the 8-bit version is unusable:įor users of older versions of Photoshop, this was an insurmountable problem: either you’d end up with vast sizes for the cutout images on your website, or you’d have to put up with ugly cutouts. Instead of the new Export command they have to use the Save for Web dialog, which does offer the option of an 8-bit file – but this comes with a bitmap alpha channel, producing hard-edged cutouts. Users of older versions of Photoshop, however, don’t have this option. This results in a much smaller size than exporting 24-bit PNG files for web delivery, 24-bit images are unnecessarily wasteful. Photoshop CC 2015 introduced the option of saving an 8-bit PNG with true transparency using its Export feature. Exporting a PNG file from Photoshop with transparency is a key requirement if you want to place images on a colored or textured background in your website.
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