Open topic with navigation

Resampling an Image

Resample an image to reduce the number of zoom levels in an MG3 or MG4 image. You might resample an image for placement in an online catalog where you know it will only be displayed at a certain maximum size.

The resampling operation copies zoom levels from an existing image to make a new image. As a result, you can only resample images that meet the following criteria:

• The image must be in the MG3 or MG4 format.
• The output format for the image must be the same as the input format. For example, for an MG3 input image, you can only create a resampled MG3 output image.
• The image must have been created as an optimizable image. By default, MG3 and MG4 images are optimizable.
• The resampling operation cannot be combined with other image manipulation operations that require decoding the image data. For example, you cannot perform reprojection or color balancing operations in the same job as a resampling operation. Instead, resample the image, run the job, and then perform additional operations on the new image.

To resample an image, complete the following steps:

1. Click Advanced in the Properties tab.
2. Click the Zoom tab.
3. Select the Resample image option and select the factor by which you want to reduce the level of detail.

Resampling by a factor of two removes one zoom level and halves the image's width and height so that the result has a fourth of the area of the original. Resampling by a factor of four removes two zoom levels and quarters the image's width and height so that the result has one sixteenth of the area of the original. The number of resampling factors available in the drop-down menu is determined by the size of the original image.