Lovell Fuller
5842da22d8
Merge pull request #306 from dacarley/negate
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Add negate operation to invert all pixel values.
2015-11-17 20:45:09 +00:00
David Carley
3af62446fc
Implements greyscale thresholding
2015-11-17 12:15:34 -06:00
David Carley
33a175eafb
Implements negation.
2015-11-17 10:18:59 -06:00
Lovell Fuller
84fd1caa46
Switch default interpolator to bicubic #289
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Only use gaussian blur for non-linear interpolators
Improves performance of bilinear by ~15%
Add liborc to the packaged build to improve bicubic perf
Add examples of the various interpolation methods
Add bilinear vs bicubic to perf tests
2015-11-15 22:04:31 +00:00
Lovell Fuller
58d9e0fef7
Pre-extract rotate should not swap width/height #296
2015-11-11 22:34:30 +00:00
Brandon Aaron
79470d2e07
EXIF Orientation tags 2 and 4 were flipping instead of flopping
2015-10-16 15:41:40 -04:00
Lovell Fuller
692e2d4df4
Automate expected vs actual for blur/sharpen tests
2015-09-07 14:17:35 +01:00
Lovell Fuller
658a541f49
Add test case for enlarge+embed combo #243
2015-08-12 09:26:38 +01:00
Lovell Fuller
36ac8828f2
Gamma correction and premultiply do not mix
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Skip premultiply for fast blur/sharpen
Automate gamma correction tests
2015-08-11 21:51:22 +01:00
Lovell Fuller
1091be374e
Alpha compositing: support grey+alpha src and non-alpha dst
2015-06-02 14:51:08 +01:00
Daniel Gasienica
ef8db1eebf
Premultiply alpha channel to avoid dark artifacts during tranformation
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Add `Sharp.compare(file1, file2, callback)` function for comparing images
using mean squared error (MSE). This is useful for unit tests.
See:
- https://github.com/jcupitt/libvips/issues/291
- http://entropymine.com/imageworsener/resizealpha/
2015-06-01 14:21:02 +01:00
Daniel Gasienica
64f7f1d662
Add experimental overlayWith API
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Composites an overlay image with alpha channel into the input image (which
must have alpha channel) using ‘over’ alpha compositing blend mode. This API
requires both images to have the same dimensions.
References:
- http://en.wikipedia.org/wiki/Alpha_compositing#Alpha_blending
- https://github.com/jcupitt/ruby-vips/issues/28#issuecomment-9014826
See #97 .
2015-06-01 14:21:01 +01:00
Lovell Fuller
b50fb53f27
Use image fingerprints in functional tests #122
2015-06-01 14:21:01 +01:00
