Previewing the current settings Each preview pane shows the original image. To view how the selected file format and other settings will affect the image, select the Show Preview option above a preview pane. Canvas will apply all the settings in the dialog box to the preview image. If you change a setting, Canvas will apply the new setting. Image file information When Show Preview is selected, the esti- mated file size and the number of colors in the image appear above the active preview pane. The first value is the estimated file size in 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 val- ues result in less compression and better retention of original image quality. Smoothing Enter a smoothing value from 1 to 6. JPEG compres- sion can cause color blocks to appear in an image. Smoothing softens the image to make color blocks less noticeable. Higher values pro- duce more smoothing. Progressive Select this option to create a JPEG file that web brows- ers can display at increasing resolution as the image is loaded. Downsampling This option can help improve compression. Down- sampling reduces the image resolution by averaging color values
Canvas 8 Help: File and data exchange (19 of 34)                                                    Page #163