Friday, December 11, 2015

convert multiple png images to another format gif

convert multiple png images to another format gif

Use the mogrify program to resize an image, blur, crop, despeckle, dither, draw on, flip, join, re-sample, and much more. This tool is similar to convert except that the original image file is overwritten (unless you change the file suffix with the -format option) with any changes you request. See Command Line Processing for advice on how to structure your mogrify command or see below for sample usages of the command.

Convert all our PNG images in a folder to the gif format:

# mogrify -format gif *.png

To reduce the size:

# mogrify -resize 50% rose.jpg

You can resize all your JPEG images in a folder to a maximum dimension of 256x256 with this command:

# mogrify -resize 256x256 *.jpg

You can find additional examples of using mogrify in Graphics from the Command Line. Further discussion is available in More Graphics from the Command Line and Examples of ImageMagick Usage.

Option Summary

The mogrify command recognizes these options. Click on an option to get more details about how that option works.

Option  Description
-adaptive-blur geometry  adaptively blur pixels; decrease effect near edges
-adaptive-resize geometry  adaptively resize image with data dependent triangulation.
-adaptive-sharpen geometry  adaptively sharpen pixels; increase effect near edges
-adjoin  join images into a single multi-image file
-affine matrix  affine transform matrix
-alpha  on, activate, off, deactivate, set, opaque, copy", transparent, extract, background, or shape the alpha channel
-annotate geometry text  annotate the image with text
-antialias  remove pixel-aliasing
-append  append an image sequence
-authenticate value  decipher image with this password
-auto-gamma  automagically adjust gamma level of image
-auto-level  automagically adjust color levels of image
-auto-orient  automagically orient image
-background color  background color
-bench iterations  measure performance
-bias value  add bias when convolving an image
-black-threshold value  force all pixels below the threshold into black
-blue-primary point  chromaticity blue primary point
-blue-shift factor  simulate a scene at nighttime in the moonlight
-blur geometry  reduce image noise and reduce detail levels
-border geometry  surround image with a border of color
-bordercolor color  border color
-brightness-contrast geometry  improve brightness / contrast of the image
-canny geometry  use a multi-stage algorithm to detect a wide range of edges in the image
-caption string  assign a caption to an image
-cdl filename  color correct with a color decision list
-channel type  apply option to select image channels
-charcoal radius  simulate a charcoal drawing
-chop geometry  remove pixels from the image interior
-clip  clip along the first path from the 8BIM profile
-clamp  set each pixel whose value is below zero to zero and any the pixel whose value is above the quantum range to the quantum range (e.g. 65535) otherwise the pixel value remains unchanged.
-clip-mask filename  associate clip mask with the image
-clip-path id  clip along a named path from the 8BIM profile
-clut  apply a color lookup table to the image
-complexoperator  perform complex mathematics on an image sequence
-connected-components connectivity  connected-components uniquely labeled, choose from 4 or 8 way connectivity
-contrast-stretch geometry  improve the contrast in an image by `stretching' the range of intensity value
-coalesce  merge a sequence of images
-colorize value  colorize the image with the fill color
-color-matrix matrix  apply color correction to the image.
-colors value  preferred number of colors in the image
-colorspace type  set image colorspace
-combine  combine a sequence of images
-comment string  annotate image with comment
-compose operator  set image composite operator
-composite  composite image
-compress type  image compression type
-contrast  enhance or reduce the image contrast
-convolve coefficients  apply a convolution kernel to the image
-copy geometry offset  copy pixels from one area of an image to another
-crop geometry  crop the image
-cycle amount  cycle the image colormap
-decipher filename  convert cipher pixels to plain
-debug events  display copious debugging information
-define format:option  define one or more image format options
-deconstruct  break down an image sequence into constituent parts
-delay value  display the next image after pausing
-delete index  delete the image from the image sequence
-density geometry  horizontal and vertical density of the image
-depth value  image depth
-despeckle  reduce the speckles within an image
-direction type  render text right-to-left or left-to-right
-display server  get image or font from this X server
-dispose method  layer disposal method
-distort type coefficients  distort image
-distribute-cache port  launch a pixel cache server
-dither method  apply error diffusion to image
-draw string  annotate the image with a graphic primitive
-duplicate count,indexes  duplicate an image one or more times
-edge radius  apply a filter to detect edges in the image
-emboss radius  emboss an image
-encipher filename  convert plain pixels to cipher pixels
-encoding type  text encoding type
-endian type  endianness (MSB or LSB) of the image
-enhance  apply a digital filter to enhance a noisy image
-equalize  perform histogram equalization to an image
-evaluate operator value  evaluate an arithmetic, relational, or logical expression
-evaluate-sequence operator  evaluate an arithmetic, relational, or logical expression for an image sequence
-extent geometry  set the image size
-extract geometry  extract area from image
-family name  render text with this font family
-features distance  analyze image features (e.g. contract, correlations, etc.).
-fft  implements the discrete Fourier transform (DFT)
-fill color  color to use when filling a graphic primitive
-filter type  use this filter when resizing an image
-flatten  flatten a sequence of images
-flip  flip image in the vertical direction
-floodfill geometry color  floodfill the image with color
-flop  flop image in the horizontal direction
-font name  render text with this font
-format type  output formatted image characteristics
-frame geometry  surround image with an ornamental border
-function name  apply a function to the image
-fuzz distance  colors within this distance are considered equal
-fx expression  apply mathematical expression to an image channel(s)
-gamma value  level of gamma correction
-gaussian-blur geometry  reduce image noise and reduce detail levels
-geometry geometry  preferred size or location of the image
-gravity type  horizontal and vertical text placement
-grayscale method  convert image to grayscale
-green-primary point  chromaticity green primary point
-help  print program options
-hough-lines geometry  identify lines in the image
-identify  identify the format and characteristics of the image
-ifft  implements the inverse discrete Fourier transform (DFT)
-implode amount  implode image pixels about the center
-insert index  insert last image into the image sequence
-intensity method  method to generate an intensity value from a pixel
-intent type  type of rendering intent when managing the image color
-interlace type  type of image interlacing scheme
-interline-spacing value  the space between two text lines
-interpolate method  pixel color interpolation method
-interword-spacing value  the space between two words
-kerning value  the space between two characters
-kuwahara geometry  edge preserving noise reduction filter
-label string  assign a label to an image
-lat geometry  local adaptive thresholding
-layers method  optimize or compare image layers
-level value  adjust the level of image contrast
-limit type value  pixel cache resource limit
-linear-stretch geometry  linear with saturation histogram stretch
-liquid-rescale geometry  rescale image with seam-carving
-log format  format of debugging information
-loop iterations  add Netscape loop extension to your GIF animation
-mask filename  associate a mask with the image
-mattecolor color  frame color
-median radius  apply a median filter to the image
-mean-shift geometry  delineate arbitrarily shaped clusters in the image
-metric type  measure differences between images with this metric
-mode radius  make each pixel the 'predominant color' of the neighborhood
-modulate value  vary the brightness, saturation, and hue
-monitor  monitor progress
-monochrome  transform image to black and white
-morph value  morph an image sequence
-morphology method kernel  apply a morphology method to the image
-motion-blur geometry  simulate motion blur
-negate  replace each pixel with its complementary color
-noise radius  add or reduce noise in an image
-normalize  transform image to span the full range of colors
-opaque color  change this color to the fill color
-ordered-dither NxN  ordered dither the image
-orient type  image orientation
-page geometry  size and location of an image canvas (setting)
-paint radius  simulate an oil painting
-perceptible  set each pixel whose value is less than |epsilon| to -epsilon or epsilon (whichever is closer) otherwise the pixel value remains unchanged.
-ping  efficiently determine image attributes
-pointsize value  font point size
-polaroid angle  simulate a Polaroid picture
-poly terms  build a polynomial from the image sequence and the corresponding terms (coefficients and degree pairs).
-posterize levels  reduce the image to a limited number of color levels
-precision value  set the maximum number of significant digits to be printed
-preview type  image preview type
-print string  interpret string and print to console
-process image-filter  process the image with a custom image filter
-profile filename  add, delete, or apply an image profile
-quality value  JPEG/MIFF/PNG compression level
-quantize colorspace  reduce image colors in this colorspace
-quiet  suppress all warning messages
-radial-blur angle  radial blur the image
-raise value  lighten/darken image edges to create a 3-D effect
-random-threshold low,high  random threshold the image
-red-primary point  chromaticity red primary point
-regard-warnings  pay attention to warning messages.
-region geometry  apply options to a portion of the image
-remap filename  transform image colors to match this set of colors
-render  render vector graphics
-repage geometry  size and location of an image canvas
-resample geometry  change the resolution of an image
-resize geometry  resize the image
-respect-parentheses  settings remain in effect until parenthesis boundary.
-roll geometry  roll an image vertically or horizontally
-rotate degrees  apply Paeth rotation to the image
-sample geometry  scale image with pixel sampling
-sampling-factor geometry  horizontal and vertical sampling factor
-scale geometry  scale the image
-scene value  image scene number
-seed value  seed a new sequence of pseudo-random numbers
-segment values  segment an image
-selective-blur geometry  selectively blur pixels within a contrast threshold
-separate  separate an image channel into a grayscale image
-sepia-tone threshold  simulate a sepia-toned photo
-set attribute value  set an image attribute
-shade degrees  shade the image using a distant light source
-shadow geometry  simulate an image shadow
-sharpen geometry  sharpen the image
-shave geometry  shave pixels from the image edges
-shear geometry  slide one edge of the image along the X or Y axis
-sigmoidal-contrast geometry  increase the contrast without saturating highlights or shadows
-size geometry  width and height of image
-sketch geometry  simulate a pencil sketch
-smush offset  smush an image sequence together
-solarize threshold  negate all pixels above the threshold level
-splice geometry  splice the background color into the image
-spread radius  displace image pixels by a random amount
-statistic type geometry  replace each pixel with corresponding statistic from the neighborhood
-strip  strip image of all profiles and comments
-stroke color  graphic primitive stroke color
-strokewidth value  graphic primitive stroke width
-stretch type  render text with this font stretch
-style type  render text with this font style
-swap indexes  swap two images in the image sequence
-swirl degrees  swirl image pixels about the center
-synchronize  synchronize image to storage device
-texture filename  name of texture to tile onto the image background
-threshold value  threshold the image
-thumbnail geometry  create a thumbnail of the image
-tile filename  tile image when filling a graphic primitive
-tile-offset geometry  set the image tile offset
-tint value  tint the image with the fill color
-transform  affine transform image
-transparent color  make this color transparent within the image
-transparent-color color  transparent color
-transpose  flip image in the vertical direction and rotate 90 degrees
-transverse  flop image in the horizontal direction and rotate 270 degrees
-treedepth value  color tree depth
-trim  trim image edges
-type type  image type
-undercolor color  annotation bounding box color
-unique-colors  discard all but one of any pixel color.
-units type  the units of image resolution
-unsharp geometry  sharpen the image
-verbose  print detailed information about the image
-version  print version information
-view  FlashPix viewing transforms
-vignette geometry  soften the edges of the image in vignette style
-virtual-pixel method  access method for pixels outside the boundaries of the image
-wave geometry  alter an image along a sine wave
-weight type  render text with this font weight
-white-point point  chromaticity white point
-white-threshold value  force all pixels above the threshold into white
-write filename  write images to this file

Reference:

http://www.imagemagick.org/script/mogrify.php

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