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Ulead photoimpact 12 Manual

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ULEAD PHOTOIMPACT USER GUIDE
277
The transparent background displays an object that merges with the Web
background smoothly on a Web page.
The matte color will also fill the transparent pixel area if the image already has
a mask, or you select one from Mask.
5. For an indexed PNG file (no more than 256 colors), further customize the
current palette in the Palette tab.
6. Click Save As.
Tips:
• For transparent True Color or Grayscale PNG images used for a Web page, there
is no need to choose a mask option. This is because these types of PNGs
inherently come with a mask. Yet, the file size could be large and might not be
displayed properly in some browsers.
• For transparent indexed PNG images used for a Web page, they share the same
characteristics as indexed transparent GIF images.
Testing your files with different settings
The Batch dialog box in Image Optimizer allows you to try out different color
and compression settings on the JPEG, GIF and PNG files before these files are
actually saved.
Here, you can quickly experiment with the variables that affect these image file
formats the most.
The Batch dialog boxes for both GIF and PNG test the number of colors, while the
Batch dialog box for JPEG tests the extent of compression.
To perform a batch test:
1. Click Batch in the Ulead Image Optimizer dialog box.
2. For GIF and PNG, enter the lowest number of colors to test in Fewest colors.
For JPEG, enter a percentage (0 to 100%) of compression in Lowest quality.
3. Similarly, for GIF and PNG, enter the highest number of colors to test in Most
colors. For JPEG, enter a percentage of compression in Highest quality.
4. Select either Number of tests to perform a specific number of tests or
Increment to perform a single test for every increment of 0-20 colors.
If you choose to have tests done by Increment, entering a smaller number of
increments will result in more tests being performed.
Note: For PNG True Color images, the Batch test is based on the Filter options and
is automatically performed for six times.
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