Compresses DIB data in an external image.
graphics-ports
compress-external-image external-image => result
| external-image⇩ | 
An external-image. | 
| result | 
The difference in bytes between size of the original image and the size of the compressed version. | 
The function compress-external-image converts the data of external-image into compressed DIB format.
The image data in external-image must be in Device Independent Bitmap (DIB) format.
CAPI User Guide and Reference Manual (Unix version) - 01 Dec 2021 19:33:02