This enumeration specifies types of convolution result.
Values:
IG_CONV_RESULT_RAW | The result is stored as is. |
IG_CONV_RESULT_ABS | The absolute value of the signed result is stored. |
IG_CONV_RESULT_8BIT_SIGNED | The result is stored as 8-bit signed values. |
IG_CONV_RESULT_SIGN_CENTERED | The result is stored as 8-bit signed, but 0 is equal to 0x7F. Positive numbers are from 0x7E to 0x00. Negative numbers are from 0x80 to 0xFF. This is used for images that are to be used as background tiles or watermarks. |