Here is the GIF:
The identify command-line tool reports that each frame has such transparent color:
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Transparent color: none
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identify -verbose cat.gif | grep -C 1 Transparent
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convert cat.gif -coalesce -channel a -separate -scale 1x1! -format "%[fx:u]\n" info:
However, checking this GIF with gifsicle and verifying the appropriate bytes with a hex editor clearly shows that the frames have transparent colors:
Code: Select all
+ image #0 320x203 transparent 117
disposal asis delay 0.30s
+ image #1 320x203 transparent 116
local color table [128]
disposal asis delay 0.20s
+ image #2 320x203 transparent 112
local color table [128]
disposal asis delay 0.10s
+ image #3 320x203 transparent 114
local color table [128]
disposal asis delay 0.10s
+ image #4 320x203 transparent 108
local color table [128]
disposal asis delay 0.10s
+ image #5 320x203 transparent 109
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disposal asis delay 0.10s
+ image #6 320x203 transparent 103
local color table [128]
disposal asis delay 0.10s
+ image #7 320x203 transparent 109
local color table [128]
disposal asis delay 0.10s
+ image #8 320x203 transparent 108
local color table [128]
disposal asis delay 0.10s
+ image #9 320x203 transparent 108
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disposal asis delay 0.10s
+ image #10 320x203 transparent 108
local color table [128]
disposal asis delay 0.10s
+ image #11 320x203 transparent 110
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disposal asis delay 0.10s
+ image #12 320x203 transparent 106
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+ image #13 320x203 transparent 107
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+ image #14 320x203 transparent 108
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+ image #15 320x203 transparent 109
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+ image #16 320x203 transparent 109
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disposal asis delay 0.10s
+ image #17 320x203 transparent 107
local color table [128]
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+ image #18 320x203 transparent 106
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+ image #19 320x203 transparent 109
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+ image #20 320x203 transparent 111
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+ image #21 320x203 transparent 106
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+ image #22 320x203 transparent 111
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+ image #23 320x203 transparent 106
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+ image #24 320x203 transparent 105
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+ image #25 320x203 transparent 108
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+ image #26 320x203 transparent 104
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+ image #27 320x203 transparent 104
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+ image #28 320x203 transparent 104
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+ image #29 320x203 transparent 106
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+ image #30 320x203 transparent 107
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+ image #31 320x203 transparent 104
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+ image #32 320x203 transparent 97
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+ image #33 320x203 transparent 101
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+ image #34 320x203 transparent 98
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+ image #35 320x203 transparent 98
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+ image #36 320x203 transparent 94
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+ image #37 320x203 transparent 96
local color table [128]
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+ image #38 320x203 transparent 96
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+ image #39 320x203 transparent 95
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+ image #40 320x203 transparent 94
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+ image #41 320x203 transparent 94
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disposal asis delay 0.10s
+ image #42 320x203 transparent 93
local color table [128]
disposal asis delay 0.10s
+ image #43 320x203 transparent 95
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disposal asis delay 0.10s
+ image #44 320x203 transparent 97
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disposal asis delay 0.10s
+ image #45 320x203 transparent 101
local color table [128]
disposal asis delay 0.10s
+ image #46 320x203 transparent 99
local color table [128]
disposal asis delay 0.10s
+ image #47 320x203 transparent 97
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disposal asis delay 0.10s
+ image #48 320x203 transparent 90
local color table [128]
disposal asis delay 0.10s
+ image #49 320x203 transparent 87
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disposal asis delay 0.10s
+ image #50 320x203 transparent 91
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disposal asis delay 0.10s
+ image #51 320x203 transparent 95
local color table [128]
disposal asis delay 0.10s
+ image #52 320x203 transparent 95
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disposal asis delay 0.10s
+ image #53 320x203 transparent 96
local color table [128]
disposal asis delay 0.10s
+ image #54 320x203 transparent 93
local color table [128]
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+ image #55 320x203 transparent 91
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+ image #56 320x203 transparent 102
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+ image #57 320x203 transparent 99
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+ image #58 320x203 transparent 106
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+ image #59 320x203 transparent 107
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+ image #60 320x203 transparent 113
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+ image #61 320x203 transparent 106
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+ image #62 320x203 transparent 107
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+ image #63 320x203 transparent 106
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+ image #64 320x203 transparent 107
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+ image #65 320x203 transparent 108
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+ image #66 320x203 transparent 107
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+ image #67 320x203 transparent 104
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+ image #68 320x203 transparent 104
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+ image #69 320x203 transparent 104
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+ image #70 320x203 transparent 107
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+ image #71 320x203 transparent 105
local color table [128]
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+ image #72 320x203 transparent 101
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+ image #73 320x203 transparent 101
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+ image #74 320x203 transparent 103
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+ image #75 320x203 transparent 106
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+ image #76 320x203 transparent 103
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+ image #77 320x203 transparent 103
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+ image #78 320x203 transparent 97
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+ image #79 320x203 transparent 102
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+ image #80 320x203 transparent 99
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+ image #81 320x203 transparent 104
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+ image #82 320x203 transparent 104
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+ image #83 320x203 transparent 103
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+ image #84 320x203 transparent 105
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+ image #85 320x203 transparent 101
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+ image #86 320x203 transparent 104
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+ image #87 320x203 transparent 102
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+ image #88 320x203 transparent 100
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+ image #89 320x203 transparent 103
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+ image #90 320x203 transparent 106
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+ image #91 320x203 transparent 105
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+ image #92 320x203 transparent 105
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+ image #93 320x203 transparent 103
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+ image #94 320x203 transparent 101
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+ image #95 320x203 transparent 98
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+ image #96 320x203 transparent 100
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+ image #97 320x203 transparent 99
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+ image #98 320x203 transparent 102
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+ image #99 320x203 transparent 103
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+ image #100 320x203 transparent 100
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+ image #101 320x203 transparent 106
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+ image #102 320x203 transparent 102
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+ image #103 320x203 transparent 102
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+ image #104 320x203 transparent 105
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+ image #105 320x203 transparent 110
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+ image #106 320x203 transparent 105
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+ image #107 320x203 transparent 108
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+ image #108 320x203 transparent 100
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+ image #109 320x203 transparent 106
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+ image #110 320x203 transparent 106
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+ image #111 320x203 transparent 103
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+ image #112 320x203 transparent 101
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+ image #113 320x203 transparent 105
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+ image #114 320x203 transparent 94
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+ image #115 320x203 transparent 97
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+ image #116 320x203 transparent 100
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+ image #117 320x203 transparent 96
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+ image #118 320x203 transparent 90
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+ image #119 320x203 transparent 87
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+ image #120 320x203 transparent 97
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+ image #121 320x203 transparent 96
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+ image #122 320x203 transparent 95
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+ image #123 320x203 transparent 94
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+ image #124 320x203 transparent 99
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+ image #125 320x203 transparent 97
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+ image #126 320x203 transparent 96
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+ image #127 320x203 transparent 98
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+ image #128 320x203 transparent 99
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+ image #129 320x203 transparent 95
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+ image #130 320x203 transparent 97
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+ image #131 320x203 transparent 102
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+ image #132 320x203 transparent 94
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+ image #133 320x203 transparent 93
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+ image #134 320x203 transparent 94
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+ image #135 320x203 transparent 95
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+ image #136 320x203 transparent 97
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+ image #137 320x203 transparent 96
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+ image #138 320x203 transparent 92
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+ image #139 320x203 transparent 94
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+ image #140 320x203 transparent 93
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+ image #141 320x203 transparent 96
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+ image #142 320x203 transparent 95
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+ image #143 320x203 transparent 97
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+ image #144 320x203 transparent 93
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+ image #145 320x203 transparent 93
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+ image #146 320x203 transparent 94
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+ image #147 320x203 transparent 98
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+ image #148 320x203 transparent 93
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+ image #149 320x203 transparent 95
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+ image #150 320x203 transparent 100
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+ image #151 320x203 transparent 100
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+ image #152 320x203 transparent 100
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+ image #153 320x203 transparent 99
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+ image #154 320x203 transparent 98
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+ image #155 320x203 transparent 99
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+ image #156 320x203 transparent 96
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+ image #157 320x203 transparent 101
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+ image #158 320x203 transparent 109
local color table [128]
disposal asis delay 0.10s
+ image #159 320x203 transparent 119
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+ image #160 320x203 transparent 119
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+ image #161 320x203 transparent 125
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+ image #162 320x203 transparent 119
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+ image #163 320x203 transparent 122
local color table [128]
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+ image #164 320x203 transparent 120
local color table [128]
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+ image #165 320x203 transparent 123
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+ image #166 320x203 transparent 125
local color table [128]
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+ image #167 320x203 transparent 122
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+ image #168 320x203 transparent 122
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+ image #169 320x203 transparent 123
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+ image #170 320x203 transparent 121
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+ image #171 320x203 transparent 121
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+ image #172 320x203 transparent 118
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+ image #173 320x203 transparent 116
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+ image #174 320x203 transparent 112
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+ image #175 320x203 transparent 119
local color table [128]
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+ image #176 320x203 transparent 119
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+ image #177 320x203 transparent 120
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+ image #178 320x203 transparent 121
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+ image #179 320x203 transparent 117
local color table [128]
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+ image #180 320x203 transparent 115
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+ image #181 320x203 transparent 114
local color table [128]
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+ image #182 320x203 transparent 116
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+ image #183 320x203 transparent 117
local color table [128]
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+ image #184 320x203 transparent 116
local color table [128]
disposal asis delay 0.10s
+ image #185 320x203 transparent 114
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+ image #186 320x203 transparent 111
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disposal asis delay 0.10s
+ image #187 320x203 transparent 110
local color table [128]
disposal asis delay 0.10s
+ image #188 320x203 transparent 110
local color table [128]
disposal asis delay 0.10s
+ image #189 320x203 transparent 111
local color table [128]
disposal asis delay 0.10s
+ image #190 320x203 transparent 111
local color table [128]
disposal asis delay 0.10s
+ image #191 320x203 transparent 113
local color table [128]
disposal asis delay 0.10s
+ image #192 320x203 transparent 107
local color table [128]
disposal asis delay 0.20s
+ image #193 320x203 transparent 109
local color table [128]
disposal asis delay 0.30s
+ image #194 320x203 transparent 109
local color table [128]
disposal asis delay 0.40s
Code: Select all
gifsicle -II cat.gif