我知道有关于设置transparent背景颜色的问题，但答案是解决方法。它没有设置背景，它只使一种颜色透明。如果我使用-transparent white不仅背景而且图像的白色变得透明。我的EPS文件：
$ identify test.eps
test.eps EPT 4280x8000 4280x8000+0+0 16-bit sRGB 16.13MB 0.031u 0:00.034
正如您所看到的，我有一个EPT文件，ImageMagic tells me这意味着“Adobe Encapsulated PostScript Interchange format with TIFF preview”。
TIFF确实有透明背景所以我可能需要先提取TIFF吗？ ImageMagic可以这样做，还是需要epstool？我有办法用PHP提取TIFF吗？我找到了extract using matlab。
我设法使用epstool提取tiff：
$ epstool --extract-preview test.eps test.tiff
如果我查看tiff，我看不到任何透明度，但会识别显示Transparent color: black但Background color: white，所以我想这会显示为白色。
我还尝试使用ghostscript转换eps。后来我读到ImageMagick的转换使用几乎相同，你可以用-verbose看到它：
$ convert -verbose test.eps test.png
[ghostscript library] Files/gs/gs9.05/bin/gswin64c.exe" -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=5000
00000 -dAlignToPixels=0 -dGridFitTT=2 "-sDEVICE=pngalpha" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r72x72" -g4280x8000
-dEPSCrop "-sOutputFile=test.png test.eps
如何将带有TIFF（EPT）的EPS转换为png并保持透明度？
您可以在此处看到identify test.eps和identify test.tiff：
$ identify -verbose test.eps
Image: test.eps
Format: EPT (Encapsulated PostScript with TIFF preview)
Class: DirectClass
Geometry: 4280x8000+0+0
Resolution: 72x72
Print size: 59.4444x111.111
Units: Undefined
Type: TrueColorAlpha
Endianess: Undefined
Colorspace: sRGB
Depth: 16/8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
alpha: 1-bit
Channel statistics:
Red:
min: 0 (0)
max: 65535 (1)
mean: 45066.7 (0.687674)
standard deviation: 28738.7 (0.438525)
kurtosis: -1.36435
skewness: -0.753428
Green:
min: 0 (0)
max: 65535 (1)
mean: 47254.3 (0.721054)
standard deviation: 25071.5 (0.382566)
kurtosis: -1.40104
skewness: -0.719388
Blue:
min: 0 (0)
max: 65535 (1)
mean: 56179.5 (0.857245)
standard deviation: 17871.7 (0.272705)
kurtosis: 3.22691
skewness: -2.12993
Alpha:
min: 65535 (1)
max: 65535 (1)
mean: 65535 (1)
standard deviation: 0 (0)
kurtosis: 0
skewness: 0
Image statistics:
Overall:
min: 0 (0)
max: 65535 (1)
mean: 37125.1 (0.566493)
standard deviation: 21058.8 (0.321337)
kurtosis: 1.91933
skewness: -0.72419
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Background color: white
Border color: srgba(223,223,223,1)
Matte color: grey74
Transparent color: none
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 4280x8000+0+0
Dispose: Undefined
Iterations: 0
Compression: Undefined
Orientation: Undefined
Properties:
date:create: 2014-01-23T09:10:56+01:00
date:modify: 2014-01-23T09:11:08+01:00
dc:format: image/epsf
photoshop:ColorMode: 3
ps:HiResBoundingBox: 4280x8000+0+0
ps:Level: Adobe-3.0 EPSF-3.0
signature: 8f39a1c8121b87901361e7b03bdfa7fc5363602129c9733aabc39c5b25fbcbe8
stRef:documentID: uuid:077BE8BAC383E111A613E638E2B2EB83
stRef:instanceID: xmp.iid:4a2e9641-c2df-4571-90d7-47b700e164fd
stRef:originalDocumentID: uuid:077BE8BAC383E111A613E638E2B2EB83
xmp:CreateDate: 2012-04-11T12:48:19+02:00
xmp:CreatorTool: Adobe Photoshop CS2 Windows
xmp:MetadataDate: 2013-12-16T09:41:20+01:00
xmp:ModifyDate: 2013-12-16T09:41:20+01:00
xmpMM:DocumentID: uuid:077BE8BAC383E111A613E638E2B2EB83
xmpMM:InstanceID: xmp.iid:735c11c3-22a5-4ac5-9ea9-47b4370aeb1b
xmpMM:OriginalDocumentID: uuid:077BE8BAC383E111A613E638E2B2EB83
xmpRights:Marked: False
Profiles:
Profile-8bim: 6642 bytes
Profile-exif: 398 bytes
Profile-iptc: 15 bytes
City[1,90]: 0x00000000: 254700 -%
unknown[2,0]:
Profile-xmp: 15362 bytes
Artifacts:
filename: test.eps
verbose: true
Tainted: False
Filesize: 16.13MB
Number pixels: 34.24M
Pixels per second: 25.44MB
User time: 1.342u
Elapsed time: 0:02.346
Version: ImageMagick 6.8.7-10 Q16 x64 2013-12-08 http://www.imagemagick.org
=============================================================================
=============================================================================
=============================================================================
$ identify test.tiff
Image: test.tiff
Format: TIFF (Tagged Image File Format)
Mime type: image/tiff
Class: PseudoClass
Geometry: 274x512+0+0
Resolution: 4.6099x4.6099
Print size: 59.4373x111.065
Units: PixelsPerInch
Type: Palette
Base type: Palette
Endianess: MSB
Colorspace: sRGB
Depth: 4-bit
Channel depth:
red: 4-bit
green: 4-bit
blue: 4-bit
Channel statistics:
Red:
min: 0 (0)
max: 15 (1)
mean: 10.3128 (0.687522)
standard deviation: 6.5204 (0.434694)
kurtosis: -1.33441
skewness: -0.754224
Green:
min: 0 (0)
max: 15 (1)
mean: 10.8132 (0.720879)
standard deviation: 5.69458 (0.379639)
kurtosis: -1.33212
skewness: -0.730642
Blue:
min: 0 (0)
max: 15 (1)
mean: 12.8588 (0.857254)
standard deviation: 4.08342 (0.272228)
kurtosis: 3.08512
skewness: -2.08272
Image statistics:
Overall:
min: 0 (0)
max: 15 (1)
mean: 11.3283 (0.755218)
standard deviation: 5.52625 (0.368416)
kurtosis: -0.401253
skewness: -1.15836
Colors: 128
Histogram:
265: ( 0, 0, 0) #000000 black
36: ( 0, 0, 17) #000011 srgb(0,0,17)
3: ( 0, 0, 51) #000033 srgb(0,0,51)
23: ( 0, 0, 68) #000044 srgb(0,0,68)
71: ( 0, 0, 85) #000055 srgb(0,0,85)
58: ( 0, 0,102) #000066 srgb(0,0,102)
77: ( 0, 0,119) #000077 srgb(0,0,119)
134: ( 0, 0,136) #000088 srgb(0,0,136)
206: ( 0, 0,153) #000099 srgb(0,0,153)
298: ( 0, 0,170) #0000AA srgb(0,0,170)
692: ( 0, 0,187) #0000BB srgb(0,0,187)
458: ( 0, 0,204) #0000CC srgb(0,0,204)
1116: ( 0, 0,221) #0000DD srgb(0,0,221)
592: ( 0, 0,238) #0000EE srgb(0,0,238)
28: ( 0, 17, 0) #001100 srgb(0,17,0)
2: ( 0, 34, 0) #002200 srgb(0,34,0)
1: ( 0, 51, 51) #003333 srgb(0,51,51)
48: ( 0, 51,102) #003366 srgb(0,51,102)
1315: ( 0, 51,153) #003399 srgb(0,51,153)
18344: ( 0, 51,204) #0033CC srgb(0,51,204)
3003: ( 0, 51,255) #0033FF srgb(0,51,255)
1: ( 0,102,153) #006699 srgb(0,102,153)
734: ( 0,102,204) #0066CC srgb(0,102,204)
654: ( 0,102,255) #0066FF srgb(0,102,255)
19: ( 17, 0, 0) #110000 srgb(17,0,0)
2271: ( 17, 17, 17) #111111 srgb(17,17,17)
3677: ( 34, 34, 34) #222222 srgb(34,34,34)
1: ( 51, 0,153) #330099 srgb(51,0,153)
13: ( 51, 0,204) #3300CC srgb(51,0,204)
67: ( 51, 51, 0) #333300 srgb(51,51,0)
2375: ( 51, 51, 51) #333333 grey20
33: ( 51, 51,102) #333366 srgb(51,51,102)
171: ( 51, 51,153) #333399 srgb(51,51,153)
2039: ( 51, 51,204) #3333CC srgb(51,51,204)
1329: ( 51, 51,255) #3333FF srgb(51,51,255)
1: ( 51,102, 0) #336600 srgb(51,102,0)
10: ( 51,102,102) #336666 srgb(51,102,102)
145: ( 51,102,153) #336699 srgb(51,102,153)
963: ( 51,102,204) #3366CC srgb(51,102,204)
585: ( 51,102,255) #3366FF srgb(51,102,255)
1504: ( 68, 68, 68) #444444 srgb(68,68,68)
893: ( 85, 85, 85) #555555 srgb(85,85,85)
1: (102, 0,102) #660066 srgb(102,0,102)
9: (102, 51, 0) #663300 srgb(102,51,0)
10: (102, 51, 51) #663333 srgb(102,51,51)
9: (102, 51,102) #663366 srgb(102,51,102)
16: (102, 51,153) #663399 srgb(102,51,153)
4: (102, 51,204) #6633CC srgb(102,51,204)
9: (102, 51,255) #6633FF srgb(102,51,255)
87: (102,102, 0) #666600 srgb(102,102,0)
50: (102,102, 51) #666633 srgb(102,102,51)
289: (102,102,102) #666666 grey40
74: (102,102,153) #666699 srgb(102,102,153)
518: (102,102,204) #6666CC srgb(102,102,204)
468: (102,102,255) #6666FF srgb(102,102,255)
1: (102,153, 0) #669900 srgb(102,153,0)
1: (102,153, 51) #669933 srgb(102,153,51)
4: (102,153,102) #669966 srgb(102,153,102)
29: (102,153,153) #669999 srgb(102,153,153)
342: (102,153,204) #6699CC srgb(102,153,204)
116: (102,153,255) #6699FF srgb(102,153,255)
126: (119,119,119) #777777 srgb(119,119,119)
71: (136,136,136) #888888 srgb(136,136,136)
1: (153, 0, 51) #990033 srgb(153,0,51)
21: (153, 0,102) #990066 srgb(153,0,102)
37: (153, 51,102) #993366 srgb(153,51,102)
49: (153,102, 0) #996600 srgb(153,102,0)
9: (153,102, 51) #996633 srgb(153,102,51)
1: (153,102,102) #996666 srgb(153,102,102)
1: (153,102,153) #996699 srgb(153,102,153)
1: (153,102,204) #9966CC srgb(153,102,204)
11: (153,102,255) #9966FF srgb(153,102,255)
151: (153,153, 0) #999900 srgb(153,153,0)
71: (153,153, 51) #999933 srgb(153,153,51)
54: (153,153,102) #999966 srgb(153,153,102)
72: (153,153,153) #999999 grey60
463: (153,153,204) #9999CC srgb(153,153,204)
462: (153,153,255) #9999FF srgb(153,153,255)
8: (153,204, 51) #99CC33 srgb(153,204,51)
93: (153,204,204) #99CCCC srgb(153,204,204)
166: (153,204,255) #99CCFF srgb(153,204,255)
70: (170,170,170) #AAAAAA srgb(170,170,170)
88: (187,187,187) #BBBBBB srgb(187,187,187)
178: (204, 0, 51) #CC0033 srgb(204,0,51)
1: (204, 0,102) #CC0066 srgb(204,0,102)
19: (204, 51, 51) #CC3333 srgb(204,51,51)
4: (204, 51,102) #CC3366 srgb(204,51,102)
1: (204,102,102) #CC6666 srgb(204,102,102)
1: (204,102,153) #CC6699 srgb(204,102,153)
116: (204,153, 0) #CC9900 srgb(204,153,0)
38: (204,153, 51) #CC9933 srgb(204,153,51)
1: (204,153,102) #CC9966 srgb(204,153,102)
1: (204,153,153) #CC9999 srgb(204,153,153)
1: (204,153,204) #CC99CC srgb(204,153,204)
6: (204,153,255) #CC99FF srgb(204,153,255)
207: (204,204, 0) #CCCC00 srgb(204,204,0)
87: (204,204, 51) #CCCC33 srgb(204,204,51)
2: (204,204,102) #CCCC66 srgb(204,204,102)
13: (204,204,153) #CCCC99 srgb(204,204,153)
156: (204,204,204) #CCCCCC grey80
625: (204,204,255) #CCCCFF srgb(204,204,255)
2: (204,255, 0) #CCFF00 srgb(204,255,0)
1: (204,255,153) #CCFF99 srgb(204,255,153)
2: (204,255,204) #CCFFCC srgb(204,255,204)
3: (204,255,255) #CCFFFF srgb(204,255,255)
4: (221, 0, 0) #DD0000 srgb(221,0,0)
321: (221,221,221) #DDDDDD srgb(221,221,221)
5: (238, 0, 0) #EE0000 srgb(238,0,0)
1433: (238,238,238) #EEEEEE srgb(238,238,238)
213: (255, 0, 51) #FF0033 srgb(255,0,51)
20: (255, 51, 51) #FF3333 srgb(255,51,51)
24: (255, 51,102) #FF3366 srgb(255,51,102)
12: (255,102,102) #FF6666 srgb(255,102,102)
6: (255,102,153) #FF6699 srgb(255,102,153)
21: (255,153,153) #FF9999 srgb(255,153,153)
7: (255,153,204) #FF99CC srgb(255,153,204)
1806: (255,204, 0) #FFCC00 srgb(255,204,0)
70: (255,204, 51) #FFCC33 srgb(255,204,51)
27: (255,204,102) #FFCC66 srgb(255,204,102)
9: (255,204,153) #FFCC99 srgb(255,204,153)
25: (255,204,204) #FFCCCC srgb(255,204,204)
2: (255,204,255) #FFCCFF srgb(255,204,255)
587: (255,255, 0) #FFFF00 yellow
27: (255,255, 51) #FFFF33 srgb(255,255,51)
41: (255,255,102) #FFFF66 srgb(255,255,102)
90: (255,255,153) #FFFF99 srgb(255,255,153)
13: (255,255,204) #FFFFCC srgb(255,255,204)
85742: (255,255,255) #FFFFFF white
Colormap entries: 256
Colormap:
0: (255,255,255) #FFFFFF white
1: (255,255,204) #FFFFCC srgb(255,255,204)
2: (255,255,153) #FFFF99 srgb(255,255,153)
3: (255,255,102) #FFFF66 srgb(255,255,102)
4: (255,255, 51) #FFFF33 srgb(255,255,51)
5: (255,255, 0) #FFFF00 yellow
6: (255,204,255) #FFCCFF srgb(255,204,255)
7: (255,204,204) #FFCCCC srgb(255,204,204)
8: (255,204,153) #FFCC99 srgb(255,204,153)
9: (255,204,102) #FFCC66 srgb(255,204,102)
10: (255,204, 51) #FFCC33 srgb(255,204,51)
11: (255,204, 0) #FFCC00 srgb(255,204,0)
12: (255,153,255) #FF99FF srgb(255,153,255)
13: (255,153,204) #FF99CC srgb(255,153,204)
14: (255,153,153) #FF9999 srgb(255,153,153)
15: (255,153,102) #FF9966 srgb(255,153,102)
16: (255,153, 51) #FF9933 srgb(255,153,51)
17: (255,153, 0) #FF9900 srgb(255,153,0)
18: (255,102,255) #FF66FF srgb(255,102,255)
19: (255,102,204) #FF66CC srgb(255,102,204)
20: (255,102,153) #FF6699 srgb(255,102,153)
21: (255,102,102) #FF6666 srgb(255,102,102)
22: (255,102, 51) #FF6633 srgb(255,102,51)
23: (255,102, 0) #FF6600 srgb(255,102,0)
24: (255, 51,255) #FF33FF srgb(255,51,255)
25: (255, 51,204) #FF33CC srgb(255,51,204)
26: (255, 51,153) #FF3399 srgb(255,51,153)
27: (255, 51,102) #FF3366 srgb(255,51,102)
28: (255, 51, 51) #FF3333 srgb(255,51,51)
29: (255, 51, 0) #FF3300 srgb(255,51,0)
30: (255, 0,255) #FF00FF magenta
31: (255, 0,204) #FF00CC srgb(255,0,204)
32: (255, 0,153) #FF0099 srgb(255,0,153)
33: (255, 0,102) #FF0066 srgb(255,0,102)
34: (255, 0, 51) #FF0033 srgb(255,0,51)
35: (255, 0, 0) #FF0000 red
36: (204,255,255) #CCFFFF srgb(204,255,255)
37: (204,255,204) #CCFFCC srgb(204,255,204)
38: (204,255,153) #CCFF99 srgb(204,255,153)
39: (204,255,102) #CCFF66 srgb(204,255,102)
40: (204,255, 51) #CCFF33 srgb(204,255,51)
41: (204,255, 0) #CCFF00 srgb(204,255,0)
42: (204,204,255) #CCCCFF srgb(204,204,255)
43: (204,204,204) #CCCCCC grey80
44: (204,204,153) #CCCC99 srgb(204,204,153)
45: (204,204,102) #CCCC66 srgb(204,204,102)
46: (204,204, 51) #CCCC33 srgb(204,204,51)
47: (204,204, 0) #CCCC00 srgb(204,204,0)
48: (204,153,255) #CC99FF srgb(204,153,255)
49: (204,153,204) #CC99CC srgb(204,153,204)
50: (204,153,153) #CC9999 srgb(204,153,153)
51: (204,153,102) #CC9966 srgb(204,153,102)
52: (204,153, 51) #CC9933 srgb(204,153,51)
53: (204,153, 0) #CC9900 srgb(204,153,0)
54: (204,102,255) #CC66FF srgb(204,102,255)
55: (204,102,204) #CC66CC srgb(204,102,204)
56: (204,102,153) #CC6699 srgb(204,102,153)
57: (204,102,102) #CC6666 srgb(204,102,102)
58: (204,102, 51) #CC6633 srgb(204,102,51)
59: (204,102, 0) #CC6600 srgb(204,102,0)
60: (204, 51,255) #CC33FF srgb(204,51,255)
61: (204, 51,204) #CC33CC srgb(204,51,204)
62: (204, 51,153) #CC3399 srgb(204,51,153)
63: (204, 51,102) #CC3366 srgb(204,51,102)
64: (204, 51, 51) #CC3333 srgb(204,51,51)
65: (204, 51, 0) #CC3300 srgb(204,51,0)
66: (204, 0,255) #CC00FF srgb(204,0,255)
67: (204, 0,204) #CC00CC srgb(204,0,204)
68: (204, 0,153) #CC0099 srgb(204,0,153)
69: (204, 0,102) #CC0066 srgb(204,0,102)
70: (204, 0, 51) #CC0033 srgb(204,0,51)
71: (204, 0, 0) #CC0000 srgb(204,0,0)
72: (153,255,255) #99FFFF srgb(153,255,255)
73: (153,255,204) #99FFCC srgb(153,255,204)
74: (153,255,153) #99FF99 srgb(153,255,153)
75: (153,255,102) #99FF66 srgb(153,255,102)
76: (153,255, 51) #99FF33 srgb(153,255,51)
77: (153,255, 0) #99FF00 srgb(153,255,0)
78: (153,204,255) #99CCFF srgb(153,204,255)
79: (153,204,204) #99CCCC srgb(153,204,204)
80: (153,204,153) #99CC99 srgb(153,204,153)
81: (153,204,102) #99CC66 srgb(153,204,102)
82: (153,204, 51) #99CC33 srgb(153,204,51)
83: (153,204, 0) #99CC00 srgb(153,204,0)
84: (153,153,255) #9999FF srgb(153,153,255)
85: (153,153,204) #9999CC srgb(153,153,204)
86: (153,153,153) #999999 grey60
87: (153,153,102) #999966 srgb(153,153,102)
88: (153,153, 51) #999933 srgb(153,153,51)
89: (153,153, 0) #999900 srgb(153,153,0)
90: (153,102,255) #9966FF srgb(153,102,255)
91: (153,102,204) #9966CC srgb(153,102,204)
92: (153,102,153) #996699 srgb(153,102,153)
93: (153,102,102) #996666 srgb(153,102,102)
94: (153,102, 51) #996633 srgb(153,102,51)
95: (153,102, 0) #996600 srgb(153,102,0)
96: (153, 51,255) #9933FF srgb(153,51,255)
97: (153, 51,204) #9933CC srgb(153,51,204)
98: (153, 51,153) #993399 srgb(153,51,153)
99: (153, 51,102) #993366 srgb(153,51,102)
100: (153, 51, 51) #993333 srgb(153,51,51)
101: (153, 51, 0) #993300 srgb(153,51,0)
102: (153, 0,255) #9900FF srgb(153,0,255)
103: (153, 0,204) #9900CC srgb(153,0,204)
104: (153, 0,153) #990099 srgb(153,0,153)
105: (153, 0,102) #990066 srgb(153,0,102)
106: (153, 0, 51) #990033 srgb(153,0,51)
107: (153, 0, 0) #990000 srgb(153,0,0)
108: (102,255,255) #66FFFF srgb(102,255,255)
109: (102,255,204) #66FFCC srgb(102,255,204)
110: (102,255,153) #66FF99 srgb(102,255,153)
111: (102,255,102) #66FF66 srgb(102,255,102)
112: (102,255, 51) #66FF33 srgb(102,255,51)
113: (102,255, 0) #66FF00 srgb(102,255,0)
114: (102,204,255) #66CCFF srgb(102,204,255)
115: (102,204,204) #66CCCC srgb(102,204,204)
116: (102,204,153) #66CC99 srgb(102,204,153)
117: (102,204,102) #66CC66 srgb(102,204,102)
118: (102,204, 51) #66CC33 srgb(102,204,51)
119: (102,204, 0) #66CC00 srgb(102,204,0)
120: (102,153,255) #6699FF srgb(102,153,255)
121: (102,153,204) #6699CC srgb(102,153,204)
122: (102,153,153) #669999 srgb(102,153,153)
123: (102,153,102) #669966 srgb(102,153,102)
124: (102,153, 51) #669933 srgb(102,153,51)
125: (102,153, 0) #669900 srgb(102,153,0)
126: (102,102,255) #6666FF srgb(102,102,255)
127: (102,102,204) #6666CC srgb(102,102,204)
128: (102,102,153) #666699 srgb(102,102,153)
129: (102,102,102) #666666 grey40
130: (102,102, 51) #666633 srgb(102,102,51)
131: (102,102, 0) #666600 srgb(102,102,0)
132: (102, 51,255) #6633FF srgb(102,51,255)
133: (102, 51,204) #6633CC srgb(102,51,204)
134: (102, 51,153) #663399 srgb(102,51,153)
135: (102, 51,102) #663366 srgb(102,51,102)
136: (102, 51, 51) #663333 srgb(102,51,51)
137: (102, 51, 0) #663300 srgb(102,51,0)
138: (102, 0,255) #6600FF srgb(102,0,255)
139: (102, 0,204) #6600CC srgb(102,0,204)
140: (102, 0,153) #660099 srgb(102,0,153)
141: (102, 0,102) #660066 srgb(102,0,102)
142: (102, 0, 51) #660033 srgb(102,0,51)
143: (102, 0, 0) #660000 srgb(102,0,0)
144: ( 51,255,255) #33FFFF srgb(51,255,255)
145: ( 51,255,204) #33FFCC srgb(51,255,204)
146: ( 51,255,153) #33FF99 srgb(51,255,153)
147: ( 51,255,102) #33FF66 srgb(51,255,102)
148: ( 51,255, 51) #33FF33 srgb(51,255,51)
149: ( 51,255, 0) #33FF00 srgb(51,255,0)
150: ( 51,204,255) #33CCFF srgb(51,204,255)
151: ( 51,204,204) #33CCCC srgb(51,204,204)
152: ( 51,204,153) #33CC99 srgb(51,204,153)
153: ( 51,204,102) #33CC66 srgb(51,204,102)
154: ( 51,204, 51) #33CC33 srgb(51,204,51)
155: ( 51,204, 0) #33CC00 srgb(51,204,0)
156: ( 51,153,255) #3399FF srgb(51,153,255)
157: ( 51,153,204) #3399CC srgb(51,153,204)
158: ( 51,153,153) #339999 srgb(51,153,153)
159: ( 51,153,102) #339966 srgb(51,153,102)
160: ( 51,153, 51) #339933 srgb(51,153,51)
161: ( 51,153, 0) #339900 srgb(51,153,0)
162: ( 51,102,255) #3366FF srgb(51,102,255)
163: ( 51,102,204) #3366CC srgb(51,102,204)
164: ( 51,102,153) #336699 srgb(51,102,153)
165: ( 51,102,102) #336666 srgb(51,102,102)
166: ( 51,102, 51) #336633 srgb(51,102,51)
167: ( 51,102, 0) #336600 srgb(51,102,0)
168: ( 51, 51,255) #3333FF srgb(51,51,255)
169: ( 51, 51,204) #3333CC srgb(51,51,204)
170: ( 51, 51,153) #333399 srgb(51,51,153)
171: ( 51, 51,102) #333366 srgb(51,51,102)
172: ( 51, 51, 51) #333333 grey20
173: ( 51, 51, 0) #333300 srgb(51,51,0)
174: ( 51, 0,255) #3300FF srgb(51,0,255)
175: ( 51, 0,204) #3300CC srgb(51,0,204)
176: ( 51, 0,153) #330099 srgb(51,0,153)
177: ( 51, 0,102) #330066 srgb(51,0,102)
178: ( 51, 0, 51) #330033 srgb(51,0,51)
179: ( 51, 0, 0) #330000 srgb(51,0,0)
180: ( 0,255,255) #00FFFF cyan
181: ( 0,255,204) #00FFCC srgb(0,255,204)
182: ( 0,255,153) #00FF99 srgb(0,255,153)
183: ( 0,255,102) #00FF66 srgb(0,255,102)
184: ( 0,255, 51) #00FF33 srgb(0,255,51)
185: ( 0,255, 0) #00FF00 lime
186: ( 0,204,255) #00CCFF srgb(0,204,255)
187: ( 0,204,204) #00CCCC srgb(0,204,204)
188: ( 0,204,153) #00CC99 srgb(0,204,153)
189: ( 0,204,102) #00CC66 srgb(0,204,102)
190: ( 0,204, 51) #00CC33 srgb(0,204,51)
191: ( 0,204, 0) #00CC00 srgb(0,204,0)
192: ( 0,153,255) #0099FF srgb(0,153,255)
193: ( 0,153,204) #0099CC srgb(0,153,204)
194: ( 0,153,153) #009999 srgb(0,153,153)
195: ( 0,153,102) #009966 srgb(0,153,102)
196: ( 0,153, 51) #009933 srgb(0,153,51)
197: ( 0,153, 0) #009900 srgb(0,153,0)
198: ( 0,102,255) #0066FF srgb(0,102,255)
199: ( 0,102,204) #0066CC srgb(0,102,204)
200: ( 0,102,153) #006699 srgb(0,102,153)
201: ( 0,102,102) #006666 srgb(0,102,102)
202: ( 0,102, 51) #006633 srgb(0,102,51)
203: ( 0,102, 0) #006600 srgb(0,102,0)
204: ( 0, 51,255) #0033FF srgb(0,51,255)
205: ( 0, 51,204) #0033CC srgb(0,51,204)
206: ( 0, 51,153) #003399 srgb(0,51,153)
207: ( 0, 51,102) #003366 srgb(0,51,102)
208: ( 0, 51, 51) #003333 srgb(0,51,51)
209: ( 0, 51, 0) #003300 srgb(0,51,0)
210: ( 0, 0,255) #0000FF blue
211: ( 0, 0,204) #0000CC srgb(0,0,204)
212: ( 0, 0,153) #000099 srgb(0,0,153)
213: ( 0, 0,102) #000066 srgb(0,0,102)
214: ( 0, 0, 51) #000033 srgb(0,0,51)
215: (238, 0, 0) #EE0000 srgb(238,0,0)
216: (221, 0, 0) #DD0000 srgb(221,0,0)
217: (187, 0, 0) #BB0000 srgb(187,0,0)
218: (170, 0, 0) #AA0000 srgb(170,0,0)
219: (136, 0, 0) #880000 srgb(136,0,0)
220: (119, 0, 0) #770000 srgb(119,0,0)
221: ( 85, 0, 0) #550000 srgb(85,0,0)
222: ( 68, 0, 0) #440000 srgb(68,0,0)
223: ( 34, 0, 0) #220000 srgb(34,0,0)
224: ( 17, 0, 0) #110000 srgb(17,0,0)
225: ( 0,238, 0) #00EE00 srgb(0,238,0)
226: ( 0,221, 0) #00DD00 srgb(0,221,0)
227: ( 0,187, 0) #00BB00 srgb(0,187,0)
228: ( 0,170, 0) #00AA00 srgb(0,170,0)
229: ( 0,136, 0) #008800 srgb(0,136,0)
230: ( 0,119, 0) #007700 srgb(0,119,0)
231: ( 0, 85, 0) #005500 srgb(0,85,0)
232: ( 0, 68, 0) #004400 srgb(0,68,0)
233: ( 0, 34, 0) #002200 srgb(0,34,0)
234: ( 0, 17, 0) #001100 srgb(0,17,0)
235: ( 0, 0,238) #0000EE srgb(0,0,238)
236: ( 0, 0,221) #0000DD srgb(0,0,221)
237: ( 0, 0,187) #0000BB srgb(0,0,187)
238: ( 0, 0,170) #0000AA srgb(0,0,170)
239: ( 0, 0,136) #000088 srgb(0,0,136)
240: ( 0, 0,119) #000077 srgb(0,0,119)
241: ( 0, 0, 85) #000055 srgb(0,0,85)
242: ( 0, 0, 68) #000044 srgb(0,0,68)
243: ( 0, 0, 34) #000022 srgb(0,0,34)
244: ( 0, 0, 17) #000011 srgb(0,0,17)
245: (238,238,238) #EEEEEE srgb(238,238,238)
246: (221,221,221) #DDDDDD srgb(221,221,221)
247: (187,187,187) #BBBBBB srgb(187,187,187)
248: (170,170,170) #AAAAAA srgb(170,170,170)
249: (136,136,136) #888888 srgb(136,136,136)
250: (119,119,119) #777777 srgb(119,119,119)
251: ( 85, 85, 85) #555555 srgb(85,85,85)
252: ( 68, 68, 68) #444444 srgb(68,68,68)
253: ( 34, 34, 34) #222222 srgb(34,34,34)
254: ( 17, 17, 17) #111111 srgb(17,17,17)
255: ( 0, 0, 0) #000000 black
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Background color: white
Border color: srgb(223,223,223)
Matte color: grey74
Transparent color: black
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 274x512+0+0
Dispose: Undefined
Iterations: 0
Compression: None
Orientation: TopLeft
Properties:
date:create: 2014-01-23T10:14:15+01:00
date:modify: 2014-01-23T10:14:15+01:00
exif:PixelXDimension: 274
exif:PixelYDimension: 512
signature: 8128db49ddcfd7d2a5076949c89c3ec525556e38ddad333ec6fed29dfe58f4fb
tiff:endian: lsb
tiff:photometric: palette
tiff:rows-per-strip: 29
tiff:software: Adobe Photoshop CC (Macintosh)
tiff:timestamp: 2013:12:16 09:41:27
Profiles:
Profile-8bim: 6642 bytes
Profile-exif: 398 bytes
Profile-iptc: 15 bytes
City[1,90]: 0x00000000: 254700 -%
unknown[2,0]:
Artifacts:
filename: test.tiff
verbose: true
Tainted: False
Filesize: 149KB
Number pixels: 140K
Pixels per second: 35.07MB
User time: 0.000u
Elapsed time: 0:01.003
Version: ImageMagick 6.8.7-10 Q16 x64 2013-12-08 http://www.imagemagick.org
答案 0 :(得分：1)
很可能eps不包含透明背景。具有sRGB的色彩空间将具有透明度，并且使用-sDEVICE=pngalpha进行GhostScript转换也是正确的。在InkScape中，我创建了一个红色框，将eps放在顶部，它也有白色背景。
最后我最终删除了这样的背景：
convert -density 100 test.eps -flatten -fill none -floodfill +0+0 white test.png
-fill none将填充颜色设置为透明，-floodfill +0+0 white从左上角开始填充颜色。填满白色的一切。如果它不是白色没有任何反应！您也可以使用-fuzz 50%来替换其他背景颜色。
另请注意，有一个PHP lib for ImageMagick用于更清洁的解决方案。