Imageoptim icon3/27/2023 ![]() You can use other image compression tools that will compress images even more than Photoshop does. Find a middle ground that results in a small file size that doesn't significantly compromise the quality of the image.Adjust the number of colors used for GIFs and PNGs.Use the optimization presets in Photoshop for your image type.Use the appropriate file format for the image.To save using a variable transparency, do the following on the Save for Web screen: Change the Matte color to the background color you plan to use.Adjust the number of colors in the image (as low as possible).Make sure the box for transparency is checked.Select the preset for PNG-8 128 dithered.To save using a one color transparency, do the following on the Save for Web screen: In order to preserve the transparency, we must save the image as a GIF or a PNG. The image below, has a transparent background (as we can see from the checkerboard pattern). To create images with transparency, you must first create an image in Photoshop that has some transparency. That's still kind of big, but the photo is 600px wide, so that's ok. JPEG Medium looks good, so we'll use that. We can use the Photoshop presets for JPG. This is a photograph with continuous tones, so it should be a JPG. The preset menu on the right allows you to pick from a few common predefined file formats and settings. Note the photo size estimates outlined in the two red boxes on the left of the screenshot below. The save for web menu allows you to compare multiple versions of the same image saved in various formats and compression settings. In the Photoshop menu: File -> Export -> Save for Web (legacy).Next we'll optimize Petey by using the Save for Web menu in Photoshop. We'll trim him down to a width of 600px, which is still quite large. Let's crop and resize Petey using the Image Size menu in Photoshop. It's 2.1 MB and 3264x2448 pixels! Notice how it doesn't even fit in the browser window. Here's a photo of Petey I took on my iPhone (not even the latest and greatest one). In Photoshop, we use the Save for Web command.ĭigital cameras and phones usually save photos at a much higher resolution and size than we need on the web. Full page images may be larger, but use with caution!Īll images should be optimized before we use them in our websites.Smaller images should generally be under 25kB.How large should the file sizes of our images be? That depends on the dimensions of the image and the type of image. 1 byte is the smallest unit of measurement for computer storage. In almost all cases, larger image sizes result in larger image filesįile sizes are measured in bytes (B), kilobytes (kB), megabytes (MB) and gigabytes (GB).Usually your images are much smaller in size.In this case the image might be a few thousand pixels wide. The exception to this rule is is you are using large or full page width background images. A good rule (for now) is to make everything fit into a 1024 pixel display screen.See wikipedia for the variety in possible screen resolutions However, common display widths still range from 1920 to 2560 pixels. The monitors in the labs display at 4096x2304 pixels.Remember that your image has to fit on someone's monitor screen.Save your optimized images at the pixel dimensions you intend them to be on screen.Even though your final images may be small, working at a larger size will give you some leeway when manipulating and resizing your images (and later on when serving them to high density screens). ![]() For graphics that are important to the site, like icons and photographs, make sure you have large images to start with.Many of your web graphics may be very small.You can see this information by going to Image > Image Size. ![]() Make sure that Resample Image is checked.Pay attention to the pixel dimensions of the image.Most of them are beyond the scope of this course. There are a bunch of techniques for handling varying screen densities.You can check your screen resolution on DPI Love Screen resolutions vary quite a bit thanks to new high pixel density devices.All images on the web will be displayed on a screen of some type.Image Bytes - Page weight (via HTTP Archive).Total kilobytes - Page weight (via HTTP Archive).In order to make our web pages fast, we minimize the file size of all of our graphics (which are by far the largest part of our web pages). The larger the file size, the more time it will take the graphics to download and display. Just pixel size.Īll files associated with a web page have to be downloaded to the client computer before they can display. ![]() On the web all images are measured in pixel size. This results in print-quality graphics, but very large files. ![]() In print you often use high resolution images and save them in file formats like TIFF or PSD. Back to Week 5 page » Image Optimization Resolution and File Size ![]()
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