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| Keywords: Kcc rescale 06 im default.jpg spatial aliasing that can result when an image that contains some strong spatial frequencies is digitally rescaled An image of an 1801 engraving of King's College Chapel Cambridge was used as a test object and resized to 50 using different filters and different programs <p> The image on this page was resized to 50 using Image Magick 6 7 5 with no option specified -- this defaults to a Mitchell filter in this release of the program <p> In this case the Mitchell filter appears to give a result that is a little sharper than the IM triangle filter but a little softer than the IM Lanczos filter However sometimes it is possible that the Lanczos sharpening may itself be an artefact 1801 F Roffe after P Nash 1801 - King's College Chapel - sanders13001 jpg an engraving first published in 1801 John Roffe 1769-1850 engraver after Frederick Nash 1782 “1856 File Kcc rescale 01 gimp no interpolation jpg -- GIMP by decimation File Kcc 01 im point jpg -- ImageMagick by decimation File Kcc rescale 02 im box filter jpg -- ImageMagick using a box filter File Kcc rescale 03a Gimp bicubic interpolation jpg -- GIMP using a bicubic filter allegedly File Kcc rescale 03b Gimp lanczos interpolation jpg -- GIMP using a Lanczos filter allegedly File Kcc rescale 04 im triangle jpg -- ImageMagick using a ramp filter File Kcc rescale 05 im Lanczos jpg -- ImageMagick using a Lanczos filter File Kcc rescale 06 im default jpg -- ImageMagick default a Mitchell filter Source code convert kcc jpg -resize 50 kcc_im_default jpg PD-old-100 Uploaded with UploadWizard Aliasing | ||||
