This is probably the most basic of tasks you can do with image editing software. Digital cameras often save images in high quality, and a standard 1024 x 768 high-quality image can be about 1.5 - 2 MB large, depending on the image details. E-mailing 10 such images means an attachment size of over 10MB. Unless you (and the recipient of the e-mail) have a broadband or a very reliable dial-up connection, this can be a pain. Besides, if you are uploading images onto an image-sharing Web site such as imagestation.com or Flickr.com, you don’t really need very high quality images—ditto if you’re embedding images into a PowerPoint presentation. In all these cases, you might want to compress your images (thus also reducing quality) making for smaller file sizes.
Once your image is open in the File menu, click on Save As. Choose the directory you want to
save it in, and the extension it will have. By default, the “save as” type will be the same as that of the original image if you haven’t made changes to it such as adding layers or masks. Select the JPEG type if it’s not already selected by default, and click Save. Now a JPEG options box will pop up, giving you a quality vs. file size setting. You can move the slider to the left (smaller file size) to choose a lower quality. Alternatively, you can enter a numeric value between 1 and 12. The file size corresponding to any particular setting is displayed at the bottom of the box.
The Format Options allows you three choices—Baseline (standard), Baseline (optimized) and Progressive. Baseline Optimized can reduce file sizes better than Standard, but certain image reading software and browsers were not compatible with this—hence the option. However, for your purposes of sharing images today, you can safely choose Baseline Optimized. Now, we come to Progressive JPEG: have you observed certain images on the Web appearing initially blurred and then gradually getting clearer in three to five passes? The details appear progressively— hence the name. If you are not saving the image for the Web, you can ignore this option.
The extent to which you can reduce the file size of your images is something you have to decide based on the quality that’s acceptable to you for your purposes. The distortion that the quality loss.The JPEG saving options in Photoshop will produce also depends on the image itself. For example, an image that is already pixelated will look very bad even if its file size is reduced by a small amount, while a photo from a good digital camera can be reduced to up to 60% of its original file size with no or hardly any visible loss in quality. However, assuming a similar quality of the original images, a rule of thumb is that those that have high detail—that is, considerable variation of colors across the image—must not be reduced much (say, less than 80%), while images that have uniform spreading of a single colour can be reduced to about 40% or lesser of their original size.
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Once your image is open in the File menu, click on Save As. Choose the directory you want to
save it in, and the extension it will have. By default, the “save as” type will be the same as that of the original image if you haven’t made changes to it such as adding layers or masks. Select the JPEG type if it’s not already selected by default, and click Save. Now a JPEG options box will pop up, giving you a quality vs. file size setting. You can move the slider to the left (smaller file size) to choose a lower quality. Alternatively, you can enter a numeric value between 1 and 12. The file size corresponding to any particular setting is displayed at the bottom of the box.
The Format Options allows you three choices—Baseline (standard), Baseline (optimized) and Progressive. Baseline Optimized can reduce file sizes better than Standard, but certain image reading software and browsers were not compatible with this—hence the option. However, for your purposes of sharing images today, you can safely choose Baseline Optimized. Now, we come to Progressive JPEG: have you observed certain images on the Web appearing initially blurred and then gradually getting clearer in three to five passes? The details appear progressively— hence the name. If you are not saving the image for the Web, you can ignore this option.
The extent to which you can reduce the file size of your images is something you have to decide based on the quality that’s acceptable to you for your purposes. The distortion that the quality loss.The JPEG saving options in Photoshop will produce also depends on the image itself. For example, an image that is already pixelated will look very bad even if its file size is reduced by a small amount, while a photo from a good digital camera can be reduced to up to 60% of its original file size with no or hardly any visible loss in quality. However, assuming a similar quality of the original images, a rule of thumb is that those that have high detail—that is, considerable variation of colors across the image—must not be reduced much (say, less than 80%), while images that have uniform spreading of a single colour can be reduced to about 40% or lesser of their original size.
If you like this then please subscribe to Our feeds and Like us on Facebook for Future Updates. Thank you.
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