.TH IM_INVALIDATE 3 "5 December 2006"
.SH NAME
im_invalidate \- flush caches related to an image
.SH SYNOPSIS
.B #include <vips/vips.h>

.B void im_invalidate( IMAGE *im )

.SH DESCRIPTION
.B im_invalidate(3)
marks all caches related to the image as invalid and requring recalculation.
It needs to be called if an image changes after being made: for example, after
a paint action, or perhaps after a new frame has arrived from a video source.

Any invalidate callbacks registered on any of the affected images are
triggered.

.SH SEE\ ALSO
im_prepare(3), im_region_buffer(3), im_add_invalidate_callback(3).