Working with JPEG files
Corel PaintShop Pro lets you optimize JPEG files to maximize image quality and minimize file size.
Important! Each time you open and save a JPEG file, image data is discarded. It is a good idea to keep a copy of the original image.
JPEG Optimizer Quality
You can use compression to reduce the size of the JPEG file. When you compress a JPEG image, you delete image information. As you increase the compression, you lower the quality of the image. You can use the image preview area to help you find the best balance between file size and image quality.
You can also reduce the file size with chroma subsampling, which averages the color information for every 2 × 2 square of pixels. You can change this setting to have a larger area of color information averaged.
JPEG Optimizer Background Color
The Background Color tabbed area in the JPEG Optimizer dialog box is available if an image has transparent areas. You can determine how transparent pixels in your image are blended with a background by choosing a background color. For example, if you are placing an image on a Web background, you can select the same background color in the JPEG Optimizer to ensure the image blends seamlessly with the Web page.
JPEG Optimizer Format
You can determine how an image appears as it is being loaded. You can optimize the JPEG so that the image downloads one line at a time, starting from the top.
You can choose to have large images displayed incrementally in several passes; detail is added with each pass. This option allows the viewer to see the image as it is being downloaded.
JPEG Optimizer Download Times
You can view the size of the compressed file and estimated download times for four modem speeds.
Using the JPEG wizard
You can open the JPEG wizard from the JPEG Optimizer dialog box. This wizard guides you through the steps of optimizing a JPEG file.
To optimize and save a JPEG file
Edit workspace
1 Choose File Export JPEG Optimizer.
The JPEG Optimizer dialog box appears. The preview areas show the current image on the left and the resulting JPEG file on the right.
2 Click the Quality tab, and set or type a value in the Set compression value to control.
3 Choose a color sampling method from the Chroma Subsampling drop-list if you want to change the default setting.
4 Click the Format tab and choose one of the following options:
• Standard — downloads one line a time, starting from the top
• Progressive — displays the image incrementally in several passes, and detail is added each time
5 Click OK to open the Save As dialog box, navigate to the folder in which you want to save the new image, and type a name for the file.
6 Click Save.
You can click the Download Times tab to preview the file size of the compressed file and view an estimate of the download time at four modem speeds.
To use the JPEG wizard
Edit workspace
1 Choose File Export JPEG Optimizer.
The JPEG Optimizer dialog box appears.
2 Click Use wizard and follow the instructions.