docs/src/content/docs/changelog/v0.15.1.md
Concat Stream-based input in single operation for ~+3% perf and less GC. #429 @papandreou
Add alpha channel, if required, before extend operation. #439 @frulo
Allow overlay image to be repeated across entire image via tile option. #443 @lemnisk8
Add cutout option to overlayWith feature, applies only the alpha channel of the overlay image. #448 @kleisauke
Ensure scaling factors are calculated independently to prevent rounding errors. #452 @puzrin
Add --sharp-cxx11 flag to compile with gcc's new C++11 ABI. #456 @kapouer
Add top/left offset support to overlayWith operation. #473 @rnanwani
Add convolve operation for kernel-based convolution. #479 @mhirsch
Add greyscale option to threshold operation for colourspace conversion control. #480 @mhirsch
Ensure ICC profiles are licenced for distribution. #486 @kapouer
Allow images with an alpha channel to work with LAB-colourspace based sharpen. #490 @jwagner
Add trim operation to remove "boring" edges. #492 @kleisauke
Add bandbool feature for channel-wise boolean operations. #496 @mhirsch
Add extractChannel operation to extract a channel from an image. #497 @mhirsch
Add ability to read and write native libvips .v files. #500 @mhirsch
Add boolean feature for bitwise image operations. #501 @mhirsch