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graphicsmagick / linux

gm identify  Monterey.jpg
Monterey.jpg JPEG 1920x1080+0+0 DirectClass 8-bit 535.4Ki 0.000u 0m:0.000001s

 

display 

animate=show animation eg gif

composite=blend/merge image togather

conjure = interprets MSL

convert

import=read image from window

mogrify= image scaling, image rotation, color reduction etc overwrites original

montage =tiled image


options

-adjoin = join images into a single multi-image file

image%02d.miff


-affine <matrix>

This option provides a transform matrix {sx,rx,ry,sy,tx,ty} for use by subsequent -draw or -transform options.


-antialias

remove pixel aliasing


-append

 creates a single image where the images in the original set are stacked top-to-bottom.


 -asc-cdl <spec>


-authenticate <string>

password for pdf

 

-auto-orient

 

-average

average a set of images

 

 -backdrop

 

 -colorspace <value>
              the type of colorspace

              Choices are: CineonLog, CMYK, GRAY, HSL, HWB, OHTA, RGB,
              Rec601Luma, Rec709Luma, Rec601YCbCr, Rec709YCbCr, Transparent,
              XYZ, YCbCr, YIQ, YPbPr, or YUV.

 

 -comment "%m:%f %wx%h"


   -compress <type>
              the type of image compression

              Choices are: None, BZip, Fax, Group3, Group4, JPEG, Lossless,
              LZW, RLE, Zip, LZMA, JPEG2000, JPEG2000, JBIG, JBIG2, WebP, or
              ZSTD.


 Use the -quality option to set the compression level to be used
              by the JPEG, JPEG-2000, PNG, MIFF, MPEG, and TIFF encoders. Use
              the -sampling-factor option to set the sampling factor to be
              used by the DPX, JPEG, MPEG, and YUV encoders for downsampling
              the chroma channels.


-density <width>x<height>

  horizontal and vertical resolution in pixels of the image This
              option specifies the image resolution to store while encoding a
              raster image or the canvas resolution while rendering (reading)
              vector formats such as Postscript, PDF, WMF, and SVG into a
              raster image. Image resolution provides the unit of measure to
              apply when rendering to an output device or raster image. The
              default unit of measure is in dots per inch (DPI). The -units
              option may be used to select dots per centimeter instead.
               The default resolution is 72 dots per inch, which is equivalent
              to one point per pixel (Macintosh and Postscript standard).
              Computer screens are normally 72 or 96 dots per inch while
              printers typically support 150, 300, 600, or 1200 dots per inch.
              To determine the resolution of your display, use a ruler to
              measure the width of your screen in inches, and divide by the
              number of horizontal pixels (1024 on a 1024x768 display).  If
              the file format supports it, this option may be used to update
              the stored image resolution. Note that Photoshop stores and
              obtains image resolution from a proprietary embedded profile. If
              this profile is not stripped from the image, then Photoshop will
              continue to treat the image using its former resolution,
              ignoring the image resolution specified in the standard file
              header.  The density option is an attribute and does not alter
              the underlying raster image. It may be used to adjust the
              rendered size for desktop publishing purposes by adjusting the
              scale applied to the pixels. To resize the image so that it is
              the same size at a different resolution, use the -resample
              option.


-depth <value>
              depth of the image

              This is the number of bits of color to preserve in the image.
              Any value between 1 and QuantumDepth (build option) may be
              specified, although 8 or 16 are the most common values. Use this
              option to specify the depth of raw images whose depth is unknown
              such as GRAY, RGB, or CMYK, or to change the depth of any image
              after it has been read.  The depth option is applied to the
              pixels immediately so it may be used as a form of simple
              compression by discarding the least significant bits. Reducing
              the depth in advance may speed up color quantization, and help
              create smaller file sizes when using a compression algorithm
              like LZW or ZIP.


-format <string>
              output formatted image characteristics

              When used with the identify utility, or the convert utility with
              output written to the 'info:-' file specification, use this
              option to print information about the image in a format of your
              choosing.  You can include the image filename, type, width,
              height, Exif data, or other image attributes by embedding
              special format characters:


    %b   file size
                   %c   comment
                   %d   directory
                   %e   filename extension
                   %f   filename
                   %g   page dimensions and offsets
                   %h   height
                   %i   input filename
                   %k   number of unique colors
                   %l   label
                   %m   magick
                   %n   number of scenes
                   %o   output filename
                   %p   page number
                   %q   image bit depth
                   %r   image type description
                   %s   scene number
                   %t   top of filename
                   %u   unique temporary filename
                   %w   width
                   %x   horizontal resolution
                   %y   vertical resolution
                   %A   transparency supported
                   %C   compression type
                   %D   GIF disposal method
                   %G   Original width and height
                   %H   page height
                   %M   original filename specification
                   %O   page offset (x,y)
                   %P   page dimensions (width,height)
                   %Q   compression quality
                   %T   time delay (in centi-seconds)
                   %U   resolution units
                   %W   page width
                   %X   page horizontal offset (x)
                   %Y   page vertical offset (y)
                   %@   trim bounding box
                   %#   signature
                   \n   newlin

                  \r   carriage return
                   %%   %

 

 -format "%m:%f %wx%h"

 

   Where "<tag>" may be one of the following:

                   *  (print all Exif tags, in keyword=data format)
                   !  (print all Exif tags, in tag_number format)
                   #hhhh (print data for Exif tag #hhhh)
                   ImageWidth
                   ImageLength
                   BitsPerSample
                   Compression
                   PhotometricInterpretation
                   FillOrder
                   DocumentName
                   ImageDescription
                   Make
                   Model
                   StripOffsets
                   Orientation
                   SamplesPerPixel
                   RowsPerStrip
                   StripByteCounts
                   XResolution
                   YResolution
                   PlanarConfiguration
                   ResolutionUnit
                   TransferFunction
                   Software
                   DateTime
                   Artist
                   WhitePoint
                   PrimaryChromaticities
                   TransferRange
                   JPEGProc
                   JPEGInterchangeFormat

                   JPEGInterchangeFormatLength
                   YCbCrCoefficients
                   YCbCrSubSampling
                   YCbCrPositioning
                   ReferenceBlackWhite
                   CFARepeatPatternDim
                   CFAPattern
                   BatteryLevel
                   Copyright
                   ExposureTime
                   FNumber1
                   IPTC/NAA
                   ExifOffset
                   InterColorProfile
                   ExposureProgram
                   SpectralSensitivity
                   GPSInfo
                   ISOSpeedRatings
                   OECF
                   ExifVersion
                   DateTimeOriginal
                   DateTimeDigitized
                   ComponentsConfiguration
                   CompressedBitsPerPixel
                   ShutterSpeedValue
                   ApertureValue
                   BrightnessValue
                   ExposureBiasValue
                   MaxApertureValue
                   SubjectDistance
                   MeteringMode
                   LightSource
                   Flash
                   FocalLength
                   MakerNote
                   UserComment
                   SubSecTime
                   SubSecTimeOriginal
                   SubSecTimeDigitized
                   FlashPixVersion

                   ColorSpace
                   ExifImageWidth
                   ExifImageLength
                   InteroperabilityOffset
                   FlashEnergy
                   SpatialFrequencyResponse
                   FocalPlaneXResolution
                   FocalPlaneYResolution
                   FocalPlaneResolutionUnit
                   SubjectLocation
                   ExposureIndex
                   SensingMethod
                   FileSource
                   SceneType

 JPEG specific information (from reading a JPEG file) may be
              obtained like this:

                   %[JPEG-<tag>]

              Where "<tag>" may be one of the following:

                   *                 (all JPEG-related tags, in
                                      keyword=data format)
                   Quality           IJG JPEG "quality" estimate
                   Colorspace        JPEG colorspace numeric ID
                   Colorspace-Name   JPEG colorspace name
                   Sampling-factors  JPEG sampling factors


-geometry <width>x<height>{+-}<x>{+-}<y>{%}{@}{!}{^}{<}{>}

              Specify dimension, offset, and resize options.


example 


gm convert -resize 300 image.png resize-300-image.png

gm convert -resize 300*300

gm convert -flop     =  mirror image 

gm convert -flip    = flip verticaly 

gm convert -monochrome 

gm convert input.jpg -resize 300x output.jpg = preserve aspect ratio
gm convert input.jpg -resize x200 output.jpg = same
gm convert input.jpg -thumbnail 300x200^ -gravity center -extent 300x200 output.jpg 
   

 

 

 convert -list format

 

sudo apt install libsixel-bin

 

img2sixel 

  • -7, -8: Selects the SIXEL graphics norm. -7 selects the VT level 3 norm (default), and -8 selects the VT level 4 norm.
  • -e: Enables relative color specification.
  • -I: Ignores delays in GIF animations.
  • -i: Inverts the color output.
  • -u: Uses built-in dithering instead of an external one.
  • -g: Enables gamma correction.
  • -v: Prints the version number and exits.
  • -S, -P, -D, -O, -V, -H: Various options for handling GIF animations.
  • -p colors: Specifies the number of colors to use.
  • -m file: Specifies a source file for color quantization.
  • -d diffusiontype: Specifies the type of error diffusion.
  • -f findtype: Specifies the method for finding the nearest color.
  • -s selecttype: Specifies the method for selecting representative colors.
  • -c geometory: Specifies the output device’s screen geometry.
  • -w width, -h height: Specifies the width and height of the output image.
  • -r resamplingtype: Specifies the method for resampling.
  • -q quality: Specifies the output quality.
  • -l loopmode: Specifies the loop mode for GIF animations.
  • -t palettetype: Specifies the type of palette to use.
  • -n macronumber: Specifies the macro number for DEC SIXEL.
  • -C score: Specifies the score for color matching.
  • -b palette: Specifies the palette file.
  • -E encodepolicy: Specifies the policy for encoding.
  • -B bgcolor: Specifies the background color.
  • -o outfile: Specifies the output file. If not specified, the output is written to standard output.
  • filename ...: Specifies the input file(s). If not specified, the input is read from standard input.

 

  stty size
43 158

 

cat catimg

width=$(tput cols)
height=$(tput lines)
width=$((width * 16))
height=$((height * 16))
img2sixel -w $width -h $height $1
 


resampling  -r

 nearest  -> Nearest-Neighbor method
            gaussian -> Gaussian filter
            hanning  -> Hanning filter
            hamming  -> Hamming filter
            bilinear -> Bilinear filter (default)
            welsh    -> Welsh filter
            bicubic  -> Bicubic filter
            lanczos2 -> Lanczos-2 filter
            lanczos3 -> Lanczos-3 filter
            lanczos4 -> Lanczos-4 filter

 

lossless compression tools

 

https://imageoptim.com/versions.html

https://imageoptim.com/online

sudo apt-get install trimage

using optipng, pngcrush, advpng and jpegopti 

MozJPEG, pngquant, Pngcrush, 7zip, SVGO and Google Zopfli

 

https://github.com/google/guetzli

A perceptual JPEG encoder, aiming for excellent compression density at high visual quality

sudo apt install guetzli 

 

https://www.kokkonen.net/tjko/projects.html#jpegoptim

JPEG optimization utility providing lossless and lossy compression.

sudo apt install jpegoptim 

 

https://optipng.sourceforge.net

optiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections.  

sudo apt install optipng 


https://github.com/shssoichiro/oxipng

Multithreaded PNG optimizer written in Rust 

cargo install oxipng
 
https://pmt.sourceforge.io/pngcrush/
sudo apt install pngcrush 
 
 

 

 



other

https://converseen.fasterland.net

sudo apt install converseen 

uses imagemagick

 

https://cairosvg.org/

pip3 install cairosvg
 
https://dechifro.org/dcraw/
 
https://www.gmic.eu/
sudo apt install gmic
 
https://www.imagemagick.org/script/index.php
 
https://github.com/nagadomi/waifu2x
 https://waifu2x.udp.jp/
 

 

https://pngquant.org/
Lossy compression of PNG images. 
sudo apt install pngquant 

https://github.com/google/zopfli
Zopfli Compression Algorithm is a compression library programmed in C to
 perform very good, but slow, deflate or zlib compression. 
Highly efficient PNG optimisation tool using Google's zopfli library 
 sudo apt install zopfli 
 
https://github.com/Huluti/Curtail
 
 
 

 

 

 


 

 

 




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