Using ImageMagick to resize your Images [GTA PHP]

Transcript

1. David Newton, St. Michael’s Hospital 1 1 Using ImageMagick to

   resize your Images GTA PHP User Group, 2015-04-07 Twitter: @newtron Github: @nwtn Email: david@davidnewton.ca Slides + image credits: https://github.com/nwtn/pres-imagemagick-gtaphp

2. 2

3. 3 Responsive images are a pain in the butt

4. 4

5. 5

6. 6

7. 7 ImageMagick, y’all

8. 8

9. 9 $ brew install imagemagick

10. 10 $ brew install php56-imagick

11. 11 $ apt-get install php-imagick

12. 12 Condition (unoptimized input) File size: mean File size: %

    difference Photoshop CC, with optimization 260,305 bytes ImageMagick `-resize` 385,795 bytes 48.21%

13. 13 How does image resizing work?

14. 14 685,936 pixels 189,739 pixels

15. 15 …to 64 pixels? How do we get from 16

    pixels…

16. 16 != resampling

17. 17 …to 64 pixels? How do we get from 16

    pixels…

18. 18 …to 64 pixels? How do we get from 16

    pixels… Background interpolation

19. 19 …to 64 pixels? How do we get from 16

    pixels… Nearest-neighbour interpolation

20. 20 Nearest-neighbour interpolation

21. 21 Bicubic interpolation

22. 22 Nearest-neighbour vs. bicubic interpolation

23. 23 7 colours 1,146 colours

24. 24

25. More colours = More bytes* 25

26. 26 https://github.com/nwtn/image-resize-tests/

27. 27 How do we know which options are best?

28. Quality objective: measured with DSSIM 28

29. 29 Control Test Difference

30. 30

31. Quality subjective: from me 31

32. Test a variety of images 32

33. 33 The best* settings for ImageMagick

34. 34 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:

35. 35 https://github.com/toy/image_optim https://github.com/ajslater/picopt https://imageoptim.com/

36. 36 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:

37. 37 mogrify vs. convert

38. 38

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 resampling filter

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

42. 42 Adaptive resize Distort resize Geometry Interpolative resize Liquid rescale

    Resize Sample Scale Thumbnail

43. 43 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

45. 45

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

48. 48 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

49. 49 Fancy

50. 50 sharpening

51. 51 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

52. 52 -unsharp 0.25x0.25+8+0.045 radius sigma gain threshold

53. 53 -unsharp 0.25x0.25+8+0.045 radius sigma gain threshold

54. 54 colour reduction

55. 55 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

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61. 61 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:

62. 62 7 colours 1,146 colours

63. 63 7 colours 7 colours

64. 64 quality and compression

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 quality 10 quality 40 quality 70 quality 100

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 metadata

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

70. 70 progressive rendering

71. 71 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. 72

73. 73

74. Progressive JPEGs Good? Evil? 74

75. 75 colour space

76. 76 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

77. 77

78. 78 The best* settings for ImageMagick

79. 79 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:

80. 80 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:

81. 81 Why even bother?

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%

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%

84. 84 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%

85. 85 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%

86. 86 PHP Imagick

87. 87

88. 88

89. 89 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() ✔ ✔

90. 90

91. 91 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() ✔ ✔

92. 92 OK… but it’s still a pain in the butt

93. 93 https://github.com/nwtn/php-respimg/ Resizing with smart defaults + more coming soon?

94. 94

95. 95 https://www.npmjs.com/package/grunt-respimg Resizing with smart defaults SVG to PNG rasterization

    Optimization

96. 96 $ npm install grunt-respimg --save-dev

97. 97

98. 98

99. David Newton, St. Michael’s Hospital 99 Using ImageMagick to resize

    your Images GTA PHP User Group, 2015-04-07 Twitter: @newtron Github: @nwtn Email: david@davidnewton.ca Slides + image credits: https://github.com/nwtn/pres-imagemagick-gtaphp