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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Use the —sampling-factor option to specify the factors for chroma downsampling. Specify the image source resanple an image index represented by ustarting at zero for the first image, eg: The image size should stay the same, however.

You can include the the image filename, type, width, height, or other image attribute by embedding special format character. The image is convolved with a Gaussian operator of the given radius and standard imagemsgick sigma. The point method changes the matte value of the target pixel.

The replace method changes the matte value of any pixel that matches the color of the target pixel.


If this option is omitted, the JPEG library will use its own default values. The default gravity for the —page option is NorthWesti. Otherwise, this option is ignored. It also shifts the output by 20 pixels to the right and by 30 pixels to the bottom.

Multiplying any color with black produces black. 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.

It can be either NoneAllTraceor a comma-separated list consisting of one or more of the following domains: It is not limited to just horizontal and vertical filtering. Note that all the original images in the current image sequence are replaced by the updated alpha.

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Just the character’s presence or absence in the resize argument is what matters, not their position.

Resizing or Scaling — IM v6 Examples

Not very useful and rarely used. Offsets, if present in the geometry string, are ignored, and the —gravity option has no effect. Distort Lanczos – Jinc. Use list as the type and display searches the list of colormap types in top-to-bottom order until one is located. Therefore -sample is very fast faster than -resize — but output quality is usually worse: When creating a montage, by default the label associated with an image is displayed with the corresponding tile in the montage.

If the mask image contains an alpha channel, the opacity of each pixel is used to define imaggemagick mask. A imagemagjck is defined as noise if and only if this pixel is a maximum or minimum within the pixel window. Specify the image by its index in the sequence. desample

Command-line Tools: Convert @ ImageMagick

Similarly, the y offset normally specifies the topmost row to remove, but if the —gravity option is present with SouthWestSouthor SouthEast gravity, it specifies the distance upward from the bottom edge of the image to the bottom row to remove. Note this offset and the image size. The sequence resqmple images is replaced by a single image created by composing each image after the first over the first image.

Specify cluster threshold as the number of pixels in each cluster must exceed the the cluster threshold to be considered valid. The shorter forms are scaled up, if necessary by replication.

Resample Image to Size in Pixels With ImageMagick

The images get resampled but appear smaller in size, which was what I thought resample was exactly supposed to keep from happening! Separate indexes with a comma e.


Otherwise use the older Resizing to Fill a Given Space technique below. When converting to PostScriptuse this option to specify a header string to print above the image. Refer to quantize for a description of these values.

The shape primitives are drawn in the color specified in the preceding —fill option. A pixel outside the boundary of the image has a value dictated by the —virtual-pixel option setting. The part of the source that lies outside of the jmagemagick is combined with the part of the destination that lies outside of the source.

By clicking “Post Your Answer”, you acknowledge that you have resampld our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. When the pixel cache reaches the memory limit it uses memory mapping. This is the number of bits in a color sample within a pixel.

The degree of darkening or lightening is proportional to the difference between the source color and 0. Additionally, there are a few more differences to resampel. For example, if you want to use quality 75 for the main image and quality 90 to compress the opacity data, use —quality 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.

While it is convenient to describe the operators in terms of “shapes” they are by no means limited to mask-style operations since they are based on continuous floating-point mathematics rather than simple boolean operations. The point method recolors the target pixel.