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# sharp

v0.15.1 - 12th July 2016

  • 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