The application I am writing depends on relatively consistent output from the resample function. I need to be able to, as portably as possible. resize. -resize x+20+30 (like the -scale and -sample examples below) converts an input to an output image which has the pixel dimensions of x Hello, I am trying to reduce the resolution of images to 72×72 using convert – resample 72×72 when I do this the image size does get reduced.

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I hope this page helps. X-rotate and y-rotate give the angle of the text and x and y are offsets that give the location of the text relative to the upper left corner of the image. The following composite operators are available: The text gravity primitive only affects the placement of text and does not interact with the other primitives. 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 on a x display.

The default gravity is Center for this purpose. Use this option to apply an operation to only select channels of an image. Use of lossless JPEG is generally not recommended. If the first character imagemagickk string isthe image comment is read from a file titled by the remaining characters in the string.

Resizing or Scaling — IM v6 Examples

Choose Private and the image colors appear exactly as they are defined. The option is most useful for extracting a subregion of a very large raw image. The first image is index 0.

Resource limits may also be set using environment variables. The density option is an attribute and does not alter the underlying raster image. When minifying because the input image size may be imzgemagick than xpixels are sub-sampled with a resampl simple algorithm: Multiplying any color with black produces black. When minifying, it changes the image size simply by replacing pixel colors by averaging the respective input pixel colors together. Produces an effect similar to that of ‘difference’, but appears as lower contrast.


If the —coalesce option appears after all of the input images, all images are coalesced. The comment is not drawn on the image, but is embedded in the image datastream via a “Comment” tag or similar mechanism.

Resample Image to Size in Pixels With ImageMagick

The color to use for image transparency in colormap image formats, such as GIF. It may be used to adjust the rendered size for desktop publishing purposes by adjusting the scale applied to the pixels. Setting the density AFTER reading such an image will only resamle its output resolution, and not effect its final size in terms of pixels.

Note this offset and the image size. Surround the format specification with quotation marks to prevent your shell from misinterpreting any spaces and square brackets. AreaDiskFileMapor Memory. However, there are a few very important differences to -resize: For example, if you want to use quality 75 for the main image and quality 90 to compress the opacity data, use —quality Normally, this integer value is zero or one.

For example 50 results in a counter-clockwise rotation of 90 degrees, results in a clockwise rotation of 90 degrees, with 0 and both resulting in a rotation of degrees. See the —annotate option for another convenient way to annotate an image with text. Choose from these previews:. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie imagejagickand that your continued use of the website is subject to these policies.

When used as an option to montage—gravity gives ikagemagick direction that an image gravitates within a tile. For example, if you specify tiff as the format type and the input image filename is image. Sign up or log in Sign up using Google. Otherwise, the MNG width and imagemafick are computed from the bounding box that contains all images in the sequence.


Imayemagick stripped out the header information, but still I have the same problem. Resize and transparency posed a problem for ImageMagick before v6. My very limited understanding is that -resample changes the dpi.

The x and y offsets are treated in the same manner as in —crop. For example, a gravity of Center forces the text to be centered within the image.

The left side of the stereo pair is saved as the red channel of the output image. However, the default depth is inappropriate for some images.

When writing a GIF89 file, only the bounding box method is used to determine its dimensions. For a list of supported filters, simply run convert -list filter. This method can undo a coalesced sequence returned by the —coalesce option, and is useful for removing redundant information from a GIF or MNG animation.

The X server must support the visual you choose, otherwise an error occurs.

If the —mosaic rssample appears after all of the input images, all images are included in the mosaic. Offsets are not used. Options are processed in command line order so be sure to use these options before the —draw option. When used with the mogrify utility, this option will convert any image to the image format you specify.

The same color omagemagick displayed on two different workstations may look different due to differences in the display monitor. Choose between shared or private. For formats which do not support an image resolution, or which are multi-resolution vector based image formats, the original resolution of the image must be specified via the “-density” attribute see Density Image Meta-data before being read in.

Remember this requires IM v6.