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CODE. FREE PICS. UI. Digital Storytelling. FLAT DESIGN. Design Disasters. Clever JPEG Optimization Techniques. Advertisement When people talk about image optimization, they consider only the limited parameters offered by popular image editors, like the “Quality” slider, the number of colors in the palette, dithering and so on. Also, a few utilities, such as OptiPNG and jpegtran, manage to squeeze extra bytes out of image files. All of these are pretty well-known tools that provide Web developers and designers with straightforward techniques of image optimization.
In this article, we’ll show you a different approach to image optimization, based on how image data is stored in different formats. Let’s start with the JPEG format and a simple technique called the eight-pixel grid. Eight-Pixel Grid As you already know, a JPEG image consists of a series of 8×8 pixel blocks, which can be especially visible if you set the JPEG “Quality” parameter too low. 32×32 pixels, Quality: 10 (in Photoshop), 396 bytes.
Both white squares are the same size: 8×8 pixels. Color Optimization Larger version. (al) It's done. Clever PNG Optimization Techniques. Advertisement As a web designer you might be already familiar with the PNG image format which offers a full-featured transparency. It’s a lossless, robust, very good replacement of the elder GIF image format. As a Photoshop (or any other image editor) user you might think that there is not that many options for PNG optimization, especially for truecolor PNG’s (PNG-24 in Photoshop), which doesn’t have any. Some of you may even think that this format is “unoptimizable”. This post describes some techniques that may help you optimize your PNG-images. You may want to take a look at the following related articles: Clever JPEG Optimization Techniques1 The boring part Before we dive into image optimization techniques, we have to learn some technical details about the PNG format.
PNG was developed as an open-source replacement of the proprietary GIF format. Scanline filtering Here is how it works. As you can see, all identical colors spread vertically, not horizontally. GIF, 2568 bytes PNG, 372 bytes. Muse Feature Tour. Quora - Your Best Source for Knowledge. Showcase | SVGeneration.
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