How to achieve DPI of an image to 300 DPI value

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shubhra
Posts: 7
Joined: 2019-05-18T08:50:51-07:00
Authentication code: 1152

How to achieve DPI of an image to 300 DPI value

Post by shubhra » 2019-05-20T02:49:05-07:00

Hi Team/Fred,

I was just doing hit and trail to look for command to set/change the DPI value of an image to 300 DPI value.

I have used the below set of command.

Please suggest if you have any other better commands to achieve the same.

Code: Select all

C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>identify -format "%w x %h %x x %y" r.jpg
802 x 460 96 x 96
C:\Users\shubhra.garg>identify -format "%w x %h %x x %y" noisy.jpg
identify.exe: unable to open image `noisy.jpg': No such file or directory @ error/blob.c/OpenBlob/2675.

C:\Users\shubhra.garg>identify -format "%w x %h %x x %y" noisy.png
640 x 480 28.34 x 28.34
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>identify -verbose r.jpg
Image: r.jpg
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Mime type: image/jpeg
  Class: DirectClass
  Geometry: 802x460+0+0
  Resolution: 96x96
  Print size: 8.35417x4.79167
  Units: PixelsPerInch
  Type: TrueColor
  Endianess: Undefined
  Colorspace: sRGB
  Depth: 8-bit
  Channel depth:
    red: 8-bit
    green: 8-bit
    blue: 8-bit
  Channel statistics:
    Pixels: 368920
    Red:
      min: 0 (0)
      max: 255 (1)
      mean: 181.599 (0.712153)
      standard deviation: 75.8158 (0.297317)
      kurtosis: 0.58633
      skewness: -1.26296
      entropy: 0.851557
    Green:
      min: 0 (0)
      max: 255 (1)
      mean: 181.111 (0.710237)
      standard deviation: 75.8468 (0.297439)
      kurtosis: 0.549358
      skewness: -1.245
      entropy: 0.853374
    Blue:
      min: 0 (0)
      max: 255 (1)
      mean: 179.378 (0.703443)
      standard deviation: 75.5815 (0.296398)
      kurtosis: 0.482061
      skewness: -1.19717
      entropy: 0.856055
  Image statistics:
    Overall:
      min: 0 (0)
      max: 255 (1)
      mean: 180.696 (0.708611)
      standard deviation: 75.7481 (0.297052)
      kurtosis: 0.538806
      skewness: -1.23506
      entropy: 0.853662
  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: 802x460+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 79
  Orientation: Undefined
  Properties:
    date:create: 2019-05-15T21:04:23+06:00
    date:modify: 2019-05-09T15:57:25+05:00
    exif:Artist: Shubhra Garg
    exif:DateTimeDigitized: 2019:05:09 15:57:17
    exif:DateTimeOriginal: 2019:05:09 15:57:17
    exif:ExifOffset: 2136
    exif:SubSecTimeDigitized: 84
    exif:SubSecTimeOriginal: 84
    exif:WinXP-Author: 83, 0, 104, 0, 117, 0, 98, 0, 104, 0, 114, 0, 97, 0, 32, 0, 71, 0, 97, 0, 114, 0, 103, 0, 0, 0
    jpeg:colorspace: 2
    jpeg:sampling-factor: 2x2,1x1,1x1
    signature: b1fa66aa4f013e252595ef360194f1584d6bd0c5d863a2e44987c0d424829150
    unknown: 28, 234, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
    xmp:CreateDate: 2019-05-09T15:57:17.839
  Profiles:
    Profile-exif: 4336 bytes
    Profile-xmp: 2816 bytes
  Artifacts:
    filename: r.jpg
    verbose: true
  Tainted: False
  Filesize: 106KB
  Number pixels: 369K
  Pixels per second: 20.5MB
  User time: 0.016u
  Elapsed time: 0:01.017
  Version: ImageMagick 6.9.1-1 Q16 x64 2015-03-20 http://www.imagemagick.org

C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>convert r.jpg -density 300 y.jpg

C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>
C:\Users\shubhra.garg>identify -verbose y.jpg
Image: y.jpg
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Mime type: image/jpeg
  Class: DirectClass
  Geometry: 802x460+0+0
  Resolution: 300x300
  Print size: 2.67333x1.53333
  Units: PixelsPerInch
  Type: TrueColor
  Endianess: Undefined
  Colorspace: sRGB
  Depth: 8-bit
  Channel depth:
    red: 8-bit
    green: 8-bit
    blue: 8-bit
  Channel statistics:
    Pixels: 368920
    Red:
      min: 0 (0)
      max: 255 (1)
      mean: 181.454 (0.711585)
      standard deviation: 75.6018 (0.296478)
      kurtosis: 0.591164
      skewness: -1.26599
      entropy: 0.859436
    Green:
      min: 0 (0)
      max: 255 (1)
      mean: 180.964 (0.709662)
      standard deviation: 75.6314 (0.296594)
      kurtosis: 0.554085
      skewness: -1.24802
      entropy: 0.861252
    Blue:
      min: 0 (0)
      max: 255 (1)
      mean: 179.23 (0.702864)
      standard deviation: 75.3632 (0.295542)
      kurtosis: 0.486878
      skewness: -1.2003
      entropy: 0.863795
  Image statistics:
    Overall:
      min: 0 (0)
      max: 255 (1)
      mean: 180.549 (0.708037)
      standard deviation: 75.5322 (0.296205)
      kurtosis: 0.543601
      skewness: -1.23812
      entropy: 0.861495
  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: 802x460+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 79
  Orientation: Undefined
  Properties:
    date:create: 2019-05-16T20:23:06+06:00
    date:modify: 2019-05-16T20:23:06+06:00
    exif:Artist: Shubhra Garg
    exif:DateTimeDigitized: 2019:05:09 15:57:17
    exif:DateTimeOriginal: 2019:05:09 15:57:17
    exif:ExifOffset: 2136
    exif:SubSecTimeDigitized: 84
    exif:SubSecTimeOriginal: 84
    exif:WinXP-Author: 83, 0, 104, 0, 117, 0, 98, 0, 104, 0, 114, 0, 97, 0, 32, 0, 71, 0, 97, 0, 114, 0, 103, 0, 0, 0
    jpeg:colorspace: 2
    jpeg:sampling-factor: 2x2,1x1,1x1
    signature: 0c8a7a58b5b05bf8773caf885038723365b8c077b81ebe7a6edf8edc27744209
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    Profile-xmp: 2816 bytes
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C:\Users\shubhra.garg>

snibgo
Posts: 12428
Joined: 2010-01-23T23:01:33-07:00
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Re: How to achieve DPI of an image to 300 DPI value

Post by snibgo » 2019-05-20T05:07:28-07:00

Code: Select all

convert in.png -set units pixelsperinch -density 300 out.png
snibgo's IM pages: im.snibgo.com

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fmw42
Posts: 25757
Joined: 2007-07-02T17:14:51-07:00
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Location: Sunnyvale, California, USA

Re: How to achieve DPI of an image to 300 DPI value

Post by fmw42 » 2019-05-20T09:21:46-07:00

I have moved this to the User's forum since it has nothing to do with my scripts.

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