Using ImageMagick to resize your Images [FSTO]

Full Stack Toronto,
2015-04-08
https://github.com/nwtn/pres-imagemagick-fsto

Transcript

1. David Newton, St. Michael’s Hospital 1 1 Using ImageMagick to resize your Images Full Stack Toronto, 2015-04-08 Twitter: @newtron Github: @nwtn Email: david@davidnewton.ca Slides + image credits: https://github.com/nwtn/pres-imagemagick-fsto
3. 3 Responsive images are a pain in the butt
7. 7 ImageMagick, y’all
9. 9 $ brew install imagemagick
10. 10 Condition (unoptimized input) File size: mean File size: % difference Photoshop CC, with optimization 260,305 bytes ImageMagick `-resize` 385,795 bytes 48.21%
11. 11 How does image resizing work?
12. 12 685,936 pixels 189,739 pixels
13. 13 …to 64 pixels? How do we get from 16 pixels…
14. 14 != resampling
15. 15 …to 64 pixels? How do we get from 16 pixels…
16. 16 …to 64 pixels? How do we get from 16 pixels… Background interpolation
17. 17 …to 64 pixels? How do we get from 16 pixels… Nearest-neighbour interpolation
18. 18 Nearest-neighbour interpolation
19. 19 Bicubic interpolation
20. 20 Nearest-neighbour vs. bicubic interpolation
21. 21 7 colours 1,146 colours
23. More colours = More bytes* 23
24. 24 https://github.com/nwtn/image-resize-tests/
25. 25 How do we know which options are best?
26. Quality objective: measured with DSSIM 26
27. 27 Control Test Difference
29. Quality subjective: from me 29
30. Test a variety of images 30
31. 31 The best* settings for ImageMagick
32. 32 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.08+8.3+0.045 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB INPUT_PATH With optimization:
33. 33 https://github.com/toy/image_optim https://github.com/ajslater/picopt https://imageoptim.com/
34. 34 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH Without optimization:
35. 35 mogrify vs. convert
37. 37 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
38. 38 resampling filter
39. 39 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
40. 40 Adaptive resize Distort resize Geometry Interpolative resize Liquid rescale Resize Sample Scale Thumbnail
41. 41 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
44. 44 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
46. 46 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
47. 47 Fancy
48. 48 sharpening
49. 49 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
50. 50 -unsharp 0.25x0.25+8+0.045 radius sigma gain threshold
51. 51 -unsharp 0.25x0.25+8+0.045 radius sigma gain threshold
52. 52 colour reduction
53. 53 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
59. 59 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -colors NUMBER_OF_COLORS -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH If output file size is larger than input:
60. 60 7 colours 1,146 colours
61. 61 7 colours 7 colours
62. 62 quality and compression
63. 63 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
64. 64 quality 10 quality 40 quality 70 quality 100
65. 65 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
66. 66 metadata
67. 67 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
68. 68 progressive rendering
69. 69 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
72. Progressive JPEGs Good? Evil? 72
73. 73 colour space
74. 74 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH
76. 76 The best* settings for ImageMagick
77. 77 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.08+8.3+0.045 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB INPUT_PATH With optimization:
78. 78 mogrify -path OUTPUT_PATH -filter Triangle - define filter:support=2.0 -thumbnail OUTPUT_WIDTH -unsharp 0.25x0.25+8+0.065 -dither None - posterize 136 -quality 82 -define jpeg:fancy- upsampling=off -define png:compression-filter=5 - define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude- chunk=all -interlace none -colorspace sRGB -strip INPUT_PATH Without optimization:
79. 79 Why even bother?
80. 80 Condition (unoptimized input) File size: mean File size: % difference My settings, optimization 218,274 bytes My settings, no optimization 259,852 bytes 19.05%
81. 81 Condition (unoptimized input) File size: mean File size: % difference My settings, optimization 218,274 bytes My settings, no optimization 259,852 bytes 19.05% Photoshop CC, optimization 260,305 bytes 19.28% Photoshop CC, no optimization 299,710 bytes 35.26%
82. 82 Condition (unoptimized input) File size: mean File size: % difference My settings, optimization 218,274 bytes My settings, no optimization 259,852 bytes 19.05% Photoshop CC, optimization 260,305 bytes 19.28% Photoshop CC, no optimization 299,710 bytes 35.26% basic `-resize` / WordPress* 385,795 bytes 76.75%
83. 83 Condition (unoptimized input) File size: mean File size: % difference My settings, optimization 218,274 bytes My settings, no optimization 259,852 bytes 19.05% Photoshop CC, optimization 260,305 bytes 19.28% Photoshop CC, no optimization 299,710 bytes 35.26% CodeIgniter / ExpressionEngine 340,461 bytes 55.98% TYPO3.CMS* 359,112 bytes 64.52% basic `-resize` / WordPress* 385,795 bytes 76.75% Drupal* 397,588 bytes 82.15% Perch* 416,790 bytes 90.95% Craft CMS* 425,259 bytes 94.83% grunt-responsive-images* 500,273 bytes 129.20%
84. 84 PHP Imagick
87. 87 CLI Imagick DSSIM File Size -filter N/A N/A N/A -define filter:support setOption() ? ? -thumbnail thumbnailImage() ✗ ✗ -unsharp unsharpMaskImage() ✔ ✔ -dither & -posterize posterizeImage() ✔ ✔ -quality setImageCompressionQuality() ✔ ✗ -define jpeg:fancy-upsampling setOption() ✔ ✔ -define png:compression-filter setOption() ✔ ✔ -define png:compression-level setOption() ✔ ✔ -define png:compression-strategy setOption() ✔ ✔ -define png:exclude-chunk setOption() ✔ ✔ -interlace setInterlaceScheme() ✔ ✔ -colorspace setColorspace() ✔ ✔ -strip stripImage() ✔ ✔
89. 89 CLI Imagick DSSIM File Size -filter custom ✔ ✗ -define filter:support setOption() ✔ ✗ -thumbnail custom ✔ ✗ -unsharp unsharpMaskImage() ✔ ✔ -dither & -posterize posterizeImage() ✔ ✔ -quality setImageCompressionQuality() ✔ ✔ -define jpeg:fancy-upsampling setOption() ✔ ✔ -define png:compression-filter setOption() ✔ ✔ -define png:compression-level setOption() ✔ ✔ -define png:compression-strategy setOption() ✔ ✔ -define png:exclude-chunk setOption() ✔ ✔ -interlace setInterlaceScheme() ✔ ✔ -colorspace setColorspace() ✔ ✔ -strip stripImage() ✔ ✔
90. 90 OK… but it’s still a pain in the butt
91. 91 https://github.com/nwtn/php-respimg/ Resizing with smart defaults + more coming soon?
92. 92 $ composer require nwtn/php-respimg
94. 94 https://www.npmjs.com/package/grunt-respimg Resizing with smart defaults SVG to PNG rasterization Optimization
95. 95 $ npm install grunt-respimg --save-dev
98. David Newton, St. Michael’s Hospital 98 Using ImageMagick to resize your Images Full Stack Toronto, 2015-04-08 Twitter: @newtron Github: @nwtn Email: david@davidnewton.ca Slides + image credits: https://github.com/nwtn/pres-imagemagick-fsto