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Canvas 12 User Guide
kilobytes. The second value is the number of discrete colors that will be saved in a GIF file; the value
is not shown for JPEG format.
JPEG options
To use JPEG format, select JPEG from the Format menu. Canvas applies the JPEG format and settings
to the active preview pane.
Quality: Enter a percentage value from 1-100%. Higher Quality values result in less
compression and better retention of original image quality.
Smoothing: Enter a smoothing value from 1 to 6. JPEG compression can cause color blocks
to appear in an image. Smoothing softens the image to make color blocks less noticeable.
Higher values produce more smoothing.
Progressive: Select this option to create a JPEG file that Web browsers can display at
increasing resolution as the image is loaded.
Downsampling: This option can help improve compression. Downsampling reduces the
image resolution by averaging color values while preserving luminosity details. Programs
displaying the image will “upsample” to the original resolution, so greater compression is
achieved without changing the display resolution of the image.
Optimized: This option can help produce smaller file sizes. When Optimized is selected,
some of the least important color information is discarded to produce more efficient
compression.
GIF options
To use GIF format, select GIF from the Format menu. Canvas applies the GIF format and settings to
the active preview pane.
Max colors Use the menu or type in the box to specify the maximum number of
colors to be used in the image. Fewer colors can result in a smaller file,
but too few colors will degrade an image.
Palette A palette is a set of colors used in an image. To be saved in GIF format,
an image can contain no more than 256 colors. If the image contains
more colors, the original colors are mapped to the colors in the palette
that you choose.
Adaptive: Creates a palette that tries to match as close as possible
all the colors in the image. This option is the best for preserving the
original color range of an image.
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