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Note, some resampling functions are damped oscillations in approximation of a Sinc function. As such, you may get negative lobes if your release of ImageMagick is HDRI-enabled.

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If this profile exists in the image, then Photoshop will continue to treat the image using its former resolution, ignoring the image resolution specified in the standard file header. Resize the image so that its rendered size remains the same as the original at the specified target resolution.

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By default this value is ’50’ for the midpoint, but could be set to ‘0’ for top-left, ‘100’ for bottom-right, or with separate X and Y offsets such as ‘0x50’ for left-middle edge of sampling sub-region. The key feature of the -sample is that no new colors will be added to the resulting image, though some colors may disappear. The results are thus equivalent to using -resize with a -filter setting of point , though -sample is a lot faster, as it avoids all the filter processing of the image. Reverse the order of images in the current image list.

If you have more than one display application running simultaneously, use the window option to specify which application to control. If the number of colors over all the images is less than 256, then +remap should not perform any color reduction or dithering, as no color changes are needed. In that case, its only effect is to force the use of a global color table. This recommended after using either -colors or -ordered-dither to reduce the number of colors in an animated image sequence. Use +remap to reduce all images in the current image sequence to use a common color map over all the images. This equivalent to appending all the images together and color reducing those images using -colors with a 256 color limit, then -remap those colors over the original list of images. This ensures all the images follow a single color map.

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For example, if a 300 DPI image renders at 3 inches by 2 inches on a 300 DPI device, when the image has been resampled to 72 DPI, it will render at 3 inches by 2 inches on a 72 DPI device. Note that only a small number of image formats (e.g. JPEG, PNG, and TIFF) are capable of storing the image resolution. For formats which do not support an image resolution, the original resolution of the image must be specified via -density on the command line prior to specifying the resample resolution. flag is given the offset given is added to the existing offset to move the image relative to its previous position.

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As a side effect of applying a -remap of colors across all images in the current image sequence, all the images will have the same color table. That means that when saved to a file format such as GIF, it will use that color table as a single common or global color table, for all the images, without requiring extra local color tables. If the -dither setting is enabled then the given colors are dithered over the image as necessary, otherwise the closest color is selected to replace that pixel in the image. This option causes some warnings in some image formats to be treated as errors. Unlike the similar -frame option, -raise does not alter the dimensions of the image. The quality setting has no effect on the appearance or signature of PNG and MNG images, since the compression is always lossless. It is important to note that results may depend on whether or not the original image already has an included profile.

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