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convert in ubuntu
$convert -resize 320x256 woman.bmp woman320x256.png
$identify -verbose woman320x256.png
Image: woman320x256.png
Format: PNG (Portable Network Graphics)
Class: DirectClass
Geometry: 205x256+0+0
Resolution: 37.79x37.79
Print size: 5.42472x6.77428
Units: PixelsPerCentimeter
Type: TrueColor
Endianess: Undefined
Colorspace: sRGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
Red:
min: 0 (0)
max: 255 (1)
mean: 137.853 (0.540599)
standard deviation: 67.241 (0.26369)
kurtosis: -0.774067
skewness: -0.333761
Green:
min: 0 (0)
max: 255 (1)
mean: 117.199 (0.459604)
standard deviation: 60.9243 (0.238919)
kurtosis: -0.850306
skewness: -0.331505
Blue:
min: 0 (0)
max: 255 (1)
mean: 115.844 (0.454291)
standard deviation: 56.9166 (0.223202)
kurtosis: -0.756114
skewness: -0.255542
Image statistics:
Overall:
min: 0 (0)
max: 255 (1)
mean: 123.632 (0.484831)
standard deviation: 61.8402 (0.242511)
kurtosis: -0.631232
skewness: -0.247852
Rendering intent: Perceptual
Gamma: 0.45455
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)
Interlace: None
Background color: white
Border color: srgb(223,223,223)
Matte color: grey74
Transparent color: black
Compose: Over
Page geometry: 205x256+0+0
Dispose: Undefined
Iterations: 0
Compression: Zip
Orientation: Undefined
Properties:
date:create: 2017-04-07T23:11:28+09:00
date:modify: 2017-04-07T23:11:28+09:00
png:bKGD : chunk was found (see Background color, above)
png:cHRM : chunk was found (see Chromaticity, above)
png:gAMA : gamma=0.45454544 (See Gamma, above)
png:IHDR.bit_depth : 8
png:IHDR.color_type : 2 (Truecolor)
png:IHDR.interlace_method: 0 (Not interlaced)
png:IHDR.width,height : 205, 256
png:pHYs : x_res=3779, y_res=3779, units=1
png:sRGB : intent=0 (See Rendering intent)
png:text : 2 tEXt/zTXt/iTXt chunks were found
signature: bb30e9a8bbd0157063dd397a7f75d18a64338e084d2324d296e7a1b12649b445
Artifacts:
filename: woman320x256.png
verbose: true
Tainted: True
Filesize: 87.6KB
Number pixels: 52.5K
Pixels per second: 5.248MB
User time: 0.000u
Elapsed time: 0:01.009
Version: ImageMagick 6.7.7-10 2017-03-14 Q16 http://www.imagemagick.org
convert in ubuntu