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| View Original: | Kcc_rescale_01_gimp_no_interpolation.jpg (557x425) | |||
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| Keywords: Kcc rescale 01 gimp no interpolation.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 GIMP with the most basic no interpolation option -- i e merely retaining every other pixel The interaction between this and spatially repeated structures in the engraving see WP on spatial aliasing has resulted in a highly visible MoirĂ© pattern MoirĂ© banding pattern becoming apparent in the sky the clouds and the building on the right <p> Other images in the series look at the results of using various available lowpass filter s to try to minimse or suppress such artefacts 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 1801 PD-Old-100 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 Aliasing | ||||
