-Blue channel -Threshold -Grayscale -8 bit

[bracker]

Hi there, I am treating Digital Hemispherical Photographs and even thought I was able to run everything I want perfectly, I am strugling with the output format, I am sure somebody can help me. I think it's just the case of me being not very smart.

I need to go through the following processes:

1) Turn the red and green channels off. Isolate the blue channel in order to increase the contrast with the sky.

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-channel B -separate 

generates a gray image in the blue channel

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-channel RG -fx 0

actually turns the picture blue, the way I want.

2) Threshold

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-threshold 76% 

A good number for most of my pictures, but I am actually studying threshold methods

3) Save into a gray scale, 8-bit, bmp image.

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-type grayscale -depth 8 -test.bmp

Lovely! However, it's not the format that I want. I generated another picture from the original with GIMP by hand, and it actually worked.

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identify -verbose test_gimp.bmp

Image: test_gimp.bmp
Format: BMP (Microsoft Windows bitmap image)
Class: PseudoClass
Geometry: 2272x1704+0+0
Resolution: 28.35x28.35
Print size: 80.1411x60.1058
Units: PixelsPerCentimeter
Type: Grayscale
Base type: Grayscale
Endianess: Undefined
Colorspace: RGB
Depth: 8-bit
Channel depth:
gray: 1-bit
Channel statistics:
gray:
min: 0 (0)
max: 255 (1)
mean: 91.4037 (0.358446)
standard deviation: 122.284 (0.479544)
kurtosis: -1.65146
skewness: 0.59037
Histogram:
2483769: ( 0, 0, 0) #000000 black
1387719: (255,255,255) #FFFFFF white
Colormap: 256
0: ( 0, 0, 0) #000000 black
1: ( 1, 1, 1) #010101 rgb(1,1,1)
2: ( 2, 2, 2) #020202 rgb(2,2,2)
3: ( 3, 3, 3) #030303 grey1
4: ( 4, 4, 4) #040404 rgb(4,4,4)
5: ( 5, 5, 5) #050505 grey2
6: ( 6, 6, 6) #060606 rgb(6,6,6)
7: ( 7, 7, 7) #070707 rgb(7,7,7)
8: ( 8, 8, #080808 grey3
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10: ( 10, 10, 10) #0A0A0A grey4
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13: ( 13, 13, 13) #0D0D0D grey5
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15: ( 15, 15, 15) #0F0F0F grey6
16: ( 16, 16, 16) #101010 rgb(16,16,16)
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107: (107,107,107) #6B6B6B grey42
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125: (125,125,125) #7D7D7D grey49
126: (126,126,126) #7E7E7E gray
127: (127,127,127) #7F7F7F rgb(127,127,127)
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136: (136,136,136) #888888 rgb(136,136,136)
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140: (140,140,140) #8C8C8C grey55
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167: (167,167,167) #A7A7A7 rgb(167,167,167)
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169: (169,169,169) #A9A9A9 DarkGray
170: (170,170,170) #AAAAAA rgb(170,170,170)
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178: (178,178,178) #B2B2B2 rgb(178,178,178)
179: (179,179,179) #B3B3B3 grey70
180: (180,180,180) #B4B4B4 rgb(180,180,180)
181: (181,181,181) #B5B5B5 grey71
182: (182,182,182) #B6B6B6 rgb(182,182,182)
183: (183,183,183) #B7B7B7 rgb(183,183,183)
184: (184,184,184) #B8B8B8 grey72
185: (185,185,185) #B9B9B9 rgb(185,185,185)
186: (186,186,186) #BABABA grey73
187: (187,187,187) #BBBBBB rgb(187,187,187)
188: (188,188,188) #BCBCBC rgb(188,188,188)
189: (189,189,189) #BDBDBD grey74
190: (190,190,190) #BEBEBE grey
191: (191,191,191) #BFBFBF grey75
192: (192,192,192) #C0C0C0 silver
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210: (210,210,210) #D2D2D2 rgb(210,210,210)
211: (211,211,211) #D3D3D3 LightGray
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213: (213,213,213) #D5D5D5 rgb(213,213,213)
214: (214,214,214) #D6D6D6 grey84
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219: (219,219,219) #DBDBDB grey86
220: (220,220,220) #DCDCDC gainsboro
221: (221,221,221) #DDDDDD rgb(221,221,221)
222: (222,222,222) #DEDEDE grey87
223: (223,223,223) #DFDFDF rgb(223,223,223)
224: (224,224,224) #E0E0E0 grey88
225: (225,225,225) #E1E1E1 rgb(225,225,225)
226: (226,226,226) #E2E2E2 rgb(226,226,226)
227: (227,227,227) #E3E3E3 grey89
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229: (229,229,229) #E5E5E5 grey90
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232: (232,232,232) #E8E8E8 grey91
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234: (234,234,234) #EAEAEA rgb(234,234,234)
235: (235,235,235) #EBEBEB grey92
236: (236,236,236) #ECECEC rgb(236,236,236)
237: (237,237,237) #EDEDED grey93
238: (238,238,238) #EEEEEE rgb(238,238,238)
239: (239,239,239) #EFEFEF rgb(239,239,239)
240: (240,240,240) #F0F0F0 grey94
241: (241,241,241) #F1F1F1 rgb(241,241,241)
242: (242,242,242) #F2F2F2 grey95
243: (243,243,243) #F3F3F3 rgb(243,243,243)
244: (244,244,244) #F4F4F4 rgb(244,244,244)
245: (245,245,245) #F5F5F5 grey96
246: (246,246,246) #F6F6F6 rgb(246,246,246)
247: (247,247,247) #F7F7F7 grey97
248: (248,248,248) #F8F8F8 rgb(248,248,248)
249: (249,249,249) #F9F9F9 rgb(249,249,249)
250: (250,250,250) #FAFAFA grey98
251: (251,251,251) #FBFBFB rgb(251,251,251)
252: (252,252,252) #FCFCFC grey99
253: (253,253,253) #FDFDFD rgb(253,253,253)
254: (254,254,254) #FEFEFE rgb(254,254,254)
255: (255,255,255) #FFFFFF white
Rendering intent: Undefined
Interlace: None
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Page geometry: 2272x1704+0+0
Dispose: Undefined
Iterations: 0
Compression: Undefined
Orientation: Undefined
Properties:
date:create: 2015-10-08T16:04:12+01:00
date:modify: 2015-10-08T16:04:12+01:00
signature: 7bfdb178b723968ec573e00e0ba8fc89b95801e2fea305dc0a939fb95d6c47ee
Artifacts:
verbose: true
Tainted: False
Filesize: 3.693mb
Number pixels: 3.692mb
Version: ImageMagick 6.5.4-7 2012-05-07 Q16 OpenMP http://www.imagemagick.org

And

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identify -verbose test.bmp

Image: test.bmp
Format: BMP (Microsoft Windows bitmap image)
Class: PseudoClass
Geometry: 2272x1704+0+0
Resolution: 118.11x118.11
Print size: 19.2363x14.4272
Units: PixelsPerCentimeter
Type: Grayscale
Base type: Grayscale
Endianess: Undefined
Colorspace: RGB
Depth: 8-bit
Channel depth:
gray: 8-bit
Channel statistics:
gray:
min: 19 (0.0745098)
max: 237 (0.929412)
mean: 103.972 (0.407735)
standard deviation: 106.319 (0.416936)
kurtosis: -1.7957
skewness: 0.451991
Histogram:
2362452: ( 19, 19, 19) #131313 rgb(19,19,19)
1509036: (237,237,237) #EDEDED grey93
Colormap: 256
0: ( 19, 19, 19) #131313 rgb(19,19,19)
1: (237,237,237) #EDEDED grey93
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Rendering intent: Undefined
Interlace: None
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Page geometry: 2272x1704+0+0
Dispose: Undefined
Iterations: 0
Compression: Undefined
Orientation: Undefined
Properties:
date:create: 2015-10-08T14:14:10+01:00
date:modify: 2015-10-08T14:14:10+01:00
signature: ecb5ca5a9a6f8219619b0f9db8e1db466026c5b48c82aefe4a3e645aa69549f7
Artifacts:
verbose: true
Tainted: False
Filesize: 178kb
Number pixels: 3.692mb
Version: ImageMagick 6.5.4-7 2012-05-07 Q16 OpenMP http://www.imagemagick.org

Channel depth:
gray: 8-bit

has to be 1bit!

Channel statistics:
gray:
min: 19 (0.0745098)
max: 237 (0.929412)
mean: 103.972 (0.407735)
standard deviation: 106.319 (0.416936)
kurtosis: -1.7957
skewness: 0.451991

has to be equal the first case!

What can I do?

Thank you very much for your help!

[snibgo]

-channel RG -fx 0

This selects just the R and G channels for future processing. Then it sets the values (in just those channels) to zero.

You need "+channel" so future processing will apply to all channels.

[fmw42]

I have moved this topic to the Users forum, since the Consulting forum is only for paid consulting.