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2.6. COLORSMANIPULATION
131
Example207:image.jpg -rgb2luv v -split t c
2.6.44 -rgb2int
ConvertselectedimagesfromRGBtoINT24scalars.
Example208:image.jpg -rgb2int
2.6.45 -rgb2srgb(+)
ConvertselectedimagesfromRGBtosRGBcolorbases.
2.6.46 -rgb2xyz
ConvertselectedimagesfromRGBtoXYZcolorbases.theD65illuminantisusedasthewhitepoint).
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CHAPTER2. LISTOFCOMMANDS
Example209:image.jpg -rgb2xyz z -split t c
2.6.47 -rgb2xyz8
ConvertselectedimagesfromRGBtoXYZ8colorbases.
Example210:image.jpg -rgb2xyz8 -split c
2.6.48 -rgb2yiq
ConvertselectedimagesfromRGBtoYIQcolorbases.
Example211:image.jpg -rgb2yiq q -split t c
2.6.49 -rgb2yiq8
ConvertselectedimagesfromRGBtoYIQ8colorbases.
Example212:image.jpg -rgb2yiq8 -split c
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2.6. COLORSMANIPULATION
133
2.6.50 -rgb2ycbcr
ConvertselectedimagesfromRGBtoYCbCrcolorbases.
Example213:image.jpg -rgb2ycbcr -split c
2.6.51 -rgb2yuv
ConvertselectedimagesfromRGBtoYUVcolorbases.
Example214:image.jpg -rgb2yuv v -split t c
2.6.52 -rgb2yuv8
ConvertselectedimagesfromRGBtoYUV8colorbases.
Example215:image.jpg -rgb2yuv8 -split c
2.6.53 -remove
opacity
Removeopacitychannelofselectedimages.
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134
CHAPTER2. LISTOFCOMMANDS
2.6.54 -select
color
Arguments:
• tolerance[%]>=0,col1,..,colN
Selectpixelswithspecifiedcolorinselectedimages.
Example216:image.jpg --select
color 40,204,153,110
Tutorial page:
http://gmic.eu/tutorial/_select_color.shtml
2.6.55 -sepia
Apply sepia tones effect on selected images.
Example 217 : image.jpg --sepia
2.6.56 -solarize
Solarize selected images.
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2.6. COLORS MANIPULATION
135
Example 218 : image.jpg --solarize
2.6.57 -split
colors
Arguments:
tolerance>=0,
max
nb
outputs>0,
min
area>0
Split selected images as several image containing a single color.
One selected image can be split as at most ’max
nb
outputs’ images.
Output images are sorted by decreasing area of extracted color regions and have an additional alpha-channel.
Default values:
• ’tolerance=0’, ’max
nb
outputs=256’ and ’min
area=8’.
Example 219 : image.jpg -quantize 5 --split
colors , -display
rgba
2.6.58 -split
opacity
Split color and opacity parts of selected images.
2.6.59 -srgb2rgb (+)
Convert selected images from sRGB to RGB colorbases.
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136
CHAPTER 2. LIST OF COMMANDS
2.6.60 -to
a
Force selected images to have an alpha channel.
2.6.61 -to
color
Force selected images to be in color mode (RGB or RGBA).
2.6.62 -to
colormode
Arguments:
• mode={ 0=adaptive
| 1=G
| 2=GA
| 3=RGB
| 4=RGBA }
Force selected images to be in a given color mode.
Default value:
• ’mode=0’.
2.6.63 -to
gray
Force selected images to be in GRAY mode.
Example 220 : image.jpg --to
gray
2.6.64 -to
graya
Force selected images to be in GRAYA mode.
2.6.65 -to
pseudogray
Arguments:
max
step>=0,
is
perceptual
constraint={ 0
| 1 },
bits
depth>0
Convert selected scalar images ([0-255]-valued) to pseudo-gray color images.
Default parameters : ’max
step=5’, ’is
perceptual
constraint=1’ and ’bits
depth=8’.
The
original
pseudo-gray
technique
has
been
introduced
by
Rich
Franzen
[http://r0k.us/graphics/pseudoGrey.html].
Extension of this technique to arbitrary increments for more tones, has been done by David Tschumperle.
2.6. COLORS MANIPULATION
137
2.6.66 -to
rgb
Force selected images to be in RGB mode.
2.6.67 -to
rgba
Force selected images to be in RGBA mode.
2.6.68 -transfer
colors
Arguments:
• [reference
image],
transfer
brightness={ 0
| 1 }
Transfer colors of the specified reference image to selected images.
Default value:
• ’transfer
brightness=0’.
Example 221 : image.jpg --rand 0,255 --transfer
colors[0] [1],1
2.6.69 -transfer
rgb
Arguments:
• [target],
gamma>=0,
regularization>=0,
luminosity
constraints>=0,
rgb
resolution>=0,
is
constraints={ 0
| 1
}
Transfer colors from selected source images to selected reference image (given as argument).
’gamma’ determines the importance of color occurences in the matching process (0=none to 1=huge).
’regularization’ determines the number of guided filter iterations to remove quantization effects.
’luminosity
constraints’ tells if luminosity constraints must be applied on non-confident matched colors.
’is
constraints’ tells if additional hard color constraints must be set (opens an interactive window).
Default values:
• ’gamma=0.3’,’regularization=8’, ’luminosity
constraints=0.1’,
’rgb
resolution=64’ and ’is
constraints=0’.
138
CHAPTER 2. LIST OF COMMANDS
2.6.70 -xyz2rgb
Convert selected images from XYZ to RGB colorbases.
2.6.71 -xyz82rgb
Convert selected images from XYZ8 to RGB color bases.
2.6.72 -ycbcr2rgb
Convert selected images from YCbCr to RGB colorbases.
2.6.73 -yiq2rgb
Convert selected images from YIQ to RGB colorbases.
2.6.74 -yiq82rgb
Convert selected images from YIQ8 to RGB colorbases.
2.6.75 -yuv2rgb
Convert selected images from YUV to RGB colorbases.
2.6.76 -yuv82rgb
Convert selected images from YUV8 to RGB color bases.
2.7 Geometry manipulation
2.7.1 -append (+)
Arguments:
• [image],axis,
centering
• axis,
centering
Append specified image to selected images, or all selected images together, along specified axis.
(eq. to
’-a’
).
’axis’ can be { x | y | z | c }.
Usual ’centering’ values are { 0=left-justified | 0.5=centered | 1=right-justified }.
Default value:
• ’centering=0’.
2.7. GEOMETRY MANIPULATION
139
Example 222 : image.jpg -split y,10 -reverse -append y
Example 223: image.jpg -repeat 5 --rows[0] 0,{10+18
*
$>}% -done -remove[0] -append x,0.5
Example 224 : image.jpg -append[0] [0],y
140
CHAPTER 2. LIST OF COMMANDS
2.7.2 -append
tiles
Arguments:
M>=0,
N>=0,0<=
centering
x<=1,0<=
centering
y<=1
Append MxN selected tiles as new images.
If ’N’ is set to 0, number of rows is estimated automatically.
If ’M’ is set to 0, number of columns is estimated automatically.
If ’M’ and ’N’ are both set to ’0’, auto-mode is used.
If ’M’ or ’N’ is set to 0, only a single image is produced.
’centering
x’ and ’centering
y’ tells about the centering of tiles when they have different sizes.
Default values:
• ’M=0’, ’N=0’, ’centering
x=centering
y=0.5’.
Example 225 : image.jpg -split xy,4 -append
tiles ,
2.7.3 -apply
scales
Arguments:
• "command",number
of
scales>0,
min
scale[%]>=0,
max
scale[%]>=0,
scale
gamma>0,
interpolation
Apply specified command on different scales of selected images.
’interpolation’ can be { 0=none | 1=nearest | 2=average | 3=linear | 4=grid | 5=bicubic | 6=lanczos }.
Default value:
• ’min
scale=25%’, ’max
scale=100%’ and ’interpolation=3’.
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