Optimizing Images for the Web

Incarcat la data: 26 Iunie 2012

Autor: manu manuela

Pret: Gratuit

Numar pagini: 31

Tip fisier: zip

Marime fisier: 1085 kb

In this lesson, you’ll learn how to do the following:
• Optimize JPEG and GIF files, and adjust the optimization settings to achieve the desired balance between file size and image quality.
• Adjust the amount of dithering applied to an image.
• Define a transparent background for an image.
• Create a hypertext image map.
• Batch-process files to automate the optimization process.


This lesson will take about 45 minutes to complete. The lesson is designed to be done in Adobe Photoshop and Adobe ImageReady. If needed, remove the previous lesson folder from your hard drive, and copy the Lesson14 folder onto it. As you work on this lesson, you’ll overwrite the start files. If you need to restore the start files, copy them from the Adobe Photoshop Classroom in a Book CD.

Note: Windows users need to unlock the lesson files before using them. For information, see “Copying the Classroom in a Book files” on page 3. Optimizing images using Photoshop or ImageReady Adobe Photoshop and Adobe ImageReady give you an effective range of controls for compressing the file size of an image while optimizing its on-screen display quality.

Compression options vary according to the file format used to save the image.
• The JPEG format is designed to preserve the broad color range and subtle brightness variations of continuous-tone images (photographs, images with gradients). This format can represent images using millions of colors.
• The GIF format is effective at compressing solid-color images and images with areas of repetitive color (line art, logos, illustrations with type). This format uses a palette of 256 colors to represent the image, and supports background transparency.
• The PNG format is effective at compressing solid-color images and preserving sharp detail. The PNG-8 format uses a 256-color palette to represent an image; the PNG-24 format supports 24-bit color (millions of colors). However, many older browser applications do not support PNG files.

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