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It reduces the size of the file losslessly – that is, the resulting "crushed" image will have the same quality as the source image. The main purpose of pngcrush is to reduce the size of the PNG IDAT data stream by trying various combinations of compression methods and delta filters.
This image is a derivative work of the following images: File:Tuning_curve.png licensed with PD-self, PD-self/en 2009-02-14T23:55:37Z Mike.lifeguard 2711x2419 (440799 Bytes) {{Information |Description={{en|1=The derived tuning curve for a normal, intact cochlea (active), and a dead one (passive).}} |Source=Own work by uploader adapted from ...
English: This graph shows a series of points (generated by a Sin function) approximated by polinomial curves (red curve is linear, green is quadratic, orange is cubic and blue is 4th degree). Italiano: Il grafo mostra una serie di punti (generati dalla funzione seno) approssimati da curve polinomiali (in rosso di primo grado, verde di secondo ...
English: The four types of intersection of a line with a convex curve, here a regular pentagon. The intersections of the four blue lines with the curve, shown in red, are (from top to bottom) the empty set, a single point, two points, and an interval.
Original file (SVG file, nominally 926 × 563 pixels, file size: 806 bytes) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Original file (SVG file, nominally 512 × 320 pixels, file size: 662 bytes) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.