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172 Commits

Author SHA1 Message Date
Lovell Fuller
5842da22d8 Merge pull request #306 from dacarley/negate 
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 
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 
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
Lovell Fuller
8832ae0bf9 Add private maxColourDistance for functional tests 
Switch MSE-based tests to use it

Remove experimental MSE-based compare API
 2015-06-01 14:21:02 +01:00
Daniel Gasienica
ef8db1eebf Premultiply alpha channel to avoid dark artifacts during tranformation 
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 
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
Bernhard K. Weisshuhn
dce36e0074 Add normalize() for simple histogram stretching 
Available as normalize() or normalise().
Normalization takes place in LAB place and thus should not change any
colors.

Existing alpha channels are preserved untouched by normalization.
 2015-04-18 12:55:04 +02:00
Victor Mateevitsi
2d1e6f2644 Added Deep Zoom support. 
Added OpenSuse 13.1 and 13.2 support in preinstall.sh script.
Added OpenSlide support in preinstall script.
Added unit tests for Deep Zoom and OpenSlide.
 2015-03-10 14:00:27 +00:00
Lovell Fuller
c93f79daa7 Guard against InitImage failure #150 
Protects against truncated image headers
 2015-01-20 10:38:44 +00:00
Lovell Fuller
247b607afd Add SVG and PSD fixtures and tests 2014-12-05 21:35:18 +00:00
Lovell Fuller
f57a0e3b00 Ensure embedded profile, if any, is always used 
Perform sRGB conversion at end of pipe only

withMetadata exports profile, should not convert

Convert one fixture to sRGB to help test

Discovered while investigating #125
 2014-11-25 18:54:49 +00:00
Lovell Fuller
f7c2a839ad Add support for profile-less CMYK images #99 2014-11-06 11:30:19 +00:00
Lovell Fuller
db6dc6431b Add support for mirroring #62 2014-10-21 14:47:08 +01:00
Lovell Fuller
ca561daedf Test code refactor #63 
Use mocha for feature-specific unit tests

Add test coverage report via istanbul
 2014-10-20 15:32:56 +01:00