21 de outubro de 2020
If the -verbose setting is defined, a detailed report of the color clusters is returned. As the value is increased, you can expect a smoother second derivative. Segment an image by analyzing the histograms of the color components and identifying units that are homogeneous with the fuzzy c-means technique. This is part of the ImageMagick color quantization routines. If when shrinking images the original image is some integer multiple of the new image size, the number of pixels averaged together to produce the new pixel color is the same across the whole image. This is a special case known as ‘binning’ and is often used as a method of reducing noise in image such as those generated by digital cameras, especially in low light conditions. Change the image size simply by replacing pixels by averaging pixels together when minifying, or replacing pixels when magnifying.
Use +shade to return the shading results as a grayscale image. The -repage operator will also allow you to modify the ‘page’ attribute of an image for images already in memory (also see -page). However it is designed to provide a finer control of the sub-parts of this ‘attribute’. The -set pageoption will only provide a direct, unmodified assignment of ‘page’ attribute.
The sum of squares of two or more images, provided the weights are equal and the exponents equal 2. combines multiple images according to a weighted sum of polynomials; one floating point weight and one floating point polynomial exponent for each image expressed as comma separated pairs. Use +polaroid to rotate the image at a random angle between -15 and +15 degrees. For convenience you can specify the page size using media . Offsets can then be added as with othergeometry arguments (e.g. -page Letter+43+43). Set the size and location of an image on the larger virtual canvas.
Perform either hard or soft thresholding within some range of values in an image. For the BPG image format, quality/2 is the actual BPG compression level . For the MIFF and TIFF image formats, quality/10 is the Zip/BZip compression level, which is 0 to 9 . It has no effect on the image appearance, since the compression is always lossless. 0none1sub2up3average4PaethIf filter-type is 5, adaptive filtering is used when quality is greater than 50 and the image does not have a color map, otherwise no filtering is used. reduce the image to a limited number of color levels per channel.
A given a canvas size of zero such as ‘0x0’ forces it to recalculate the canvas size so the image will appear completely on that canvas . Note, the remap image colormap has at most 8-bits of precision. Deeper color maps are automagically coalesced with other colors to meet this requirement. Reduce the number of colors in an image to the colors used by this image. This the same as using a mask used for composite masking operations, with grayscale values causing blended updates of the image the mask is attached to.
minify / magnify the image with pixel block averaging and pixel replication, respectively. Change the image size simply by directly sampling the pixels original from the image. minify / magnify the image with pixel subsampling and pixel replication, respectively. Empty triangles in the corners, left over from rotating the image, are filled with the background color. roll an image vertically or horizontally by the amount given. The -set ‘page’ option can be used to directly assign virtual canvas meta-data. Use +repage to completely remove/reset the virtual canvas meta-data from the images.
That is the direction people would consider the object is coming from. Using a very high contrast will produce a sort of ‘smoothed thresholding’ of the image. Not as sharp of a true threshold, but with tapered gray-levels around the thresholdmid-point. To achieve the equivalent wikidll.com/aol of a sigmoidal brightness change , you would use -sigmoidal-contrast brightnessx0% to increase brightness and +sigmoidal-contrast brightnessx0% to decrease brightness. Note the use of ‘0’ fo rthe mid-point of the sigmoidal curve. Increase the contrast of the image using a sigmoidal transfer function without saturating highlights or shadows. For example, 0 is none, 3 is typical and 20 is a lot.
When both angles are given, the horizontal component of the shear is performed before the vertical component. The size portion of the geometryargument specifies the width of the region to be removed from both sides of the image and the height of the regions to be removed from top and bottom. Specify azimuth and elevation as the position of the light source.