Operation Manual

540 | CorelDRAW X8 User Guide
The size of the bitmap on your screen depends on the pixel height and width of the bitmap, on the zoom level, and on your monitor
settings. As a result, the size of the bitmap may appear different on your screen and in print.
Changing bitmap resolution
You can change the resolution of a bitmap to increase or decrease its file size. Resolution is measured by the number of dots per inch (dpi)
when the bitmap is printed. The resolution you choose depends on how the bitmap is output. Typically, bitmaps created only for display
on computer monitors are 96 or 72 dpi and bitmaps created for the web are 72 dpi. Bitmaps created for printing on desktop printers are
generally 150 dpi, while professionally printed bitmaps are usually 300 dpi, or higher.
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.
Resizing an image
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.