System information

7.21 Viewing the properties of a pixel image
Pixel image properties
If you have pixel images in your PDF document, you can select them and view their properties,
such as their size, resolution, compression and information about their color usage.
To view the properties of a pixel image
1. Using the Select Objects tool , select a pixel image.
2. Choose Window > Show Enfocus Inspector or click the Show Inspector button to display
the Enfocus Inspector.
3. Click Image > Properties to view the properties of the selected pixel image.
7.22 Resampling pixel images
About resampling
Resampling means changing the number of pixels and the pixel dimensions of an image. Thus,
you change the (file) size but also the quality of an image, either in a positive or in a negative sense:
• You can downsample an image, which reduces the size but also the quality of the image.
• You resample an image up and increase the number of pixels. New pixels are added based on
color values of existing pixels.
You can choose:
• To resample a single image on page 142
• To resample multiple images on page 143
Reasons for downsampling an image
You may wish to downsample an image for a number of reasons:
• To increase the processing speed when editing or printing PDF documents containing pixel
images.
• To adjust the resolution of images (dpi) to their final output screen ruling, expressed in lines
per inch (lpi).
• To publish your PDF documents on the Internet.
A good rule of thumb to specify the optimal resolution is the following:
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