Operation Manual

520 | Corel DESIGNER X7 User Guide
Higher-resolution bitmaps contain smaller and more densely packed pixels than lower- resolution bitmaps. Upsampling increases the
resolution of a bitmap by adding more pixels per unit of measure. Bitmap quality may be reduced because the new pixels are interpolated
based on the colors of neighboring pixels; the original pixel information is simply spread out. You cannot use upsampling to create detail
and subtle color gradations where none existed in the original image.
Downsampling decreases the resolution of a bitmap by removing a specific number of pixels per unit of measure. Best results are usually
achieved when downsampling is done after color and tone corrections but before sharpening.
To change the dimensions of a bitmap
1 Select a bitmap.
2
Click Bitmaps Resample.
3 Choose a unit of measure from the list box next to the Width and Height boxes.
4 Type values in any of the following boxes:
• Width
• Height
If you want to minimize the jagged appearance of curves, enable the Anti-alias check box.
If you want to maintain the file size, enable the Maintain original size check box. When this check box is enabled, the resolution of the
bitmap is automatically adjusted as you change the image dimensions.
You can maintain the proportions of the bitmap by enabling the Maintain aspect ratio check box and typing a value in either the
Width or Height box.
You can also resample the bitmap as a percentage of its original size by typing values in the Width % and Height % boxes.
To change the resolution of a bitmap
1 Select a bitmap.
2
Click Bitmaps Resample.
3 In the Resolution area, type values in any of the following boxes:
• Horizontal
• Vertical
If you want to maintain the proportions of the bitmap, enable the Maintain aspect ratio check box.
If you want to maintain the file size, enable the Maintain original size check box. When this check box is enabled, the height and width
of the bitmap are automatically adjusted as you change the resolution.
You can also resample a selected bitmap by clicking the Resample button on the property bar.
Enable the Anti-alias check box to minimize the jagged appearance of curves.
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Straightening bitmaps
The Straighten image dialog box lets you correct lens distortions and straighten bitmap images quickly. This feature is useful for
straightening photos that were taken or scanned at an angle or contain lens distortions.
You can access the Straighten image dialog box by clicking Bitmaps Straighten image.