Graphics Programs Reference
In-Depth Information
The large preview window allows you to compare different file formats and compression settings.
You can compare up to four file formats and see the approximate download times and file sizes.
2
Select the 2-Up tab at the top of the preview window.
3
Click to select the second image preview to assign settings.
From the Preset drop-down menu, select JPEG High. Note that the image preview shows an image of
the file in that format and displays information about the JPEG settings in the lower-left corner.
Download information appears under the preview.
In this example, the file is reduced to 17.84K and it will take about 4 seconds to download at the
speed of about 56.6 kbps (kilobits per second).
You can change the speed and recalculate the download time by clicking the Select Download
Speed button (
) located to the right of the download speed.
You will lower the image quality in the following steps to reduce the file size.
4
Click the Compression quality drop-down menu located below the Format drop-down menu and
choose Medium; note that the settings change along with the download information. The JPEG image
format uses lossy compression to save a file. Lossy means that the image is compressed by discarding
part of the data in the file.
5
Click the Compression quality drop-down menu and choose Low. The visual quality changes and the
download time decreases.
For this example, the Low quality is too low and the download time for Medium quality is too long.
Toggle between the two settings to see that the Quality text field indicates that Low is set to 10 and
Medium is set to 30. These presets are helpful, but you can manually adjust the settings.
6
Click Quality to display the Quality slider and drag it to the right, increasing the value to
20
.
