Photoshop CS4DPD Blitz Reference
Saving a GIF
Saving a JPEG
Saving a PNG
Saving a WBMP
Matte
Saving Settings
The image download time is based upon the preference of 56K per second
Can change the download speed by choosing Edit->Preferences selecting the Status Bar category, and clicking the Connection Speed drop-down list
Saving Photoshop Images for the Web and Devices [File->Save for Web & Devices]
Can change the download speed by choosing Edit->Preferences selecting the Status Bar category, and clicking the Connection Speed drop-down list
Saving Photoshop Images for the Web and Devices [File->Save for Web & Devices]
- Resize the image to the right pixel dimensions
- Choose Filter->Sharpen->Unsharp Mask to gain back some of the detail lost when resizing the image and then save the image for the Web
- Use the GIF format for images with large areas of solid color, such as a logo
Saving a GIF
- Choose File->Save for Web & Devices
- At the top, click the 2-Up tab
- In the lower portion of the displays, see the original file size compared to the optimized file size, as well as the approximate download RMC
- Try to keep an individual image’s download RMC down to five seconds or less
- All the images on a page can add up to one monstrous wait for the viewer!
- Choose GIF 32 No Dither from the Preset drop-down list
- Photoshop supplies presets to choose from, or can customize and save one's own
- Many designers choose the No Dither option
- When image is on a transparent layer and desirable to maintain that transparency on a Web page, select the Transparency check box
- Using the color table in the Save for Web & Devices dialog box
- Based upon a color reduction algorithm chosen, the Save for Web & Devices feature samples the number of colors user indicates
- An image that has only a few colors desired to convert to Websafe colors, choose the Eyedropper tool from the left of the Save for Web & Devices dialog box and click the color, in the Optimized view
- The sampled color is highlighted in the color table
- Click the Web Safe button at the bottom of the color table
- A ToolTip appears when you hovers over this button with the text 'Shifts/ Unshifts Selected Colors to Web panel'
- A diamond appears, indicating that the color is now Web safe
- Lock colors not wanting to be deleted
- Select a color with the Eyedropper tool or choose it in the color table and then click the Lock Color button - a white square appears in the lower-right corner, indicating that the color is locked
- When locking 32 colors and then reduce the color table to 24, some of the locked colors are inevitably deleted
- However, when choosing to add colors, those locked colors are the first to return
- Use the arrows to the right of the Colors combo box or enter a number to add or delete colors from the color table
- When keeping colors Web safe is important, select the Restrictive (Web) option for the method
- When wanting image to look better on most monitors but not necessarily be Web safe, choose the Adaptive option
- When image uses transparency, select the Transparency check box
- Remember that transparency is counted as one of the colors in the color table
- Select the Interlaced check box only when GIF image is large in size (25K or larger)
- Selecting this option causes the image to build in several scans on the Web page, a low-resolution image that pops up quickly to be refreshed with the higher resolution image when it’s finished downloading
- Interlacing gives the illusion of the download going faster but makes the file size larger, so use it only when necessary
Saving a JPEG
- The JPEG format is lossy, so one shouldn’t open it, edit it, and save it again as a JPEG
- Because the JPEG compression causes data to be lost, the image will eventually look like it was printed on a paper towel
- Save a copy of the file as a JPEG, keeping the original image in the PSD format for later changes
- The JPEG format does not support transparency, but can cheat the system a little by using matting
- Choose File->Save for Web & Devices and then click the 2-Up tab
- Choose one of the JPEG preset settings from the Settings drop-down list
- Can choose Low, Medium, High, or customize a level in between the presets by using the Quality slider
- Leave the Optimized check box selected to build the best JPEG at the smallest size
- Leave the Embed Color Profile check box deselected unless a color-managed workflow and color accuracy is essential
- When have to have the file size even smaller, use the Blur slider to bring down some detail
- One JPEG that’s the exact same pixel dimensions as another may vary in file size because the more detailed an image, the more information is needed
- So an image of lots of apples will be larger than an image the same size that has a lot of clear blue sky in it
- The blur feature does blur the image so use this for only a Low Source image in Dreamweaver
- (Optional) Choose a matte color from the Matte drop-down list
- Because JPEG doesn’t support transparency, can flood the transparent area with a color that one chooses from the Matte drop-down list
- Choose the color to use for the background of a Web page by choosing Other and entering the hexadecimal color in the lower portion of the Color Picker
- Click Save
Saving a PNG
- PNG is not yet widely supported
- PNG-24 images have file sizes that can be too large to use on the Web - much larger than a JPEG file
- Can apply varying amounts of transparency in an image where the image shows through to the background
- PNG-8 doesn’t offer any advantage over a regular GIF file
Saving a WBMP
- WBMP (Wireless BitMap) is one-bit color (just black and white, without shades)
Matte
- Matting looks for pixels that are greater than 50-percent transparent and makes them fully transparent; any pixels that are 50 percent or less transparent become fully opaque
- Even though an image might be on a transparent layer, there will be some awkward pixels, the ones that aren’t quite transparent or not quite un-transparent
- Choose a matte color to blend in with the transparent awkward pixels by selecting Eyedropper, White, Black, or Other (to open the Color Picker)
Saving Settings
- Click the arrow to the right of the Preset drop-down list
- Choose Save Settings from the menu that appears and give your settings a name
- The named, customized settings then appear in the Preset drop-down list
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