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========================== P. R. I. C. E. ========================== written by Riccardo Mottola rm@gnu.org Home on Sourceforge: http://price.sourceforge.net http://sourceforge.net/projects/price/ Document Revision: 23 April 2012 Current Version: 1.1.0 WHAT IS IT ? ------------ PRICE, which stands for Precision Raster Image Convolution Engine, aims to be a high quality Image filtering, enhancing and manipulation program. It is written in Objective-C and AppKit, thus designed for Cocoa and GNUstep, it should be portable to OpenSTEP (I hope so, currently I don't have the computers to do the porting). TO DO ----- - check for planar/striped images - Implement color median filter for luma only ? - Brightness and Contrast should preserve the alpha channel - Convolution should preserve the alpha channel - Scale should work and preserve the alpha channel - Crop should work and preserve the alpha channel - Median filter should preserve the alpha channel - Equalization filter should preserve the alpha channel NOTES ----- - development and testing is currently done on MacOS-X 10.2, 10.3, 10.4 and a G3, G4, please report problems on other versions. 10.1 is now rarely tested but appears to continue to work. - GNUstep versions have been tested by me on Solaris, Linux (x86, ppc, 68k), MkLinux-ppc, OpenBSD/sparc, FreeBSD, NetBSD HISTORY ------- -- what's new in 1.1.0 -- (23 April 2012) + Bilinear scaling + bug fixes in custom edge tracer + filters now close preview on Cancel + Curves level correction + GNUstep convolve mantrix now acts on end-editing and not on enter, fixing year old limitation! -- what's new in 1.0.0 -- (08 August 2010) + Preview for filters + improvments and cleanup in the filter architecture -- what's new in 0.9.1 -- (31 December 2009) + cleaned and fixed notifications and outlets of the window controller, which fixes a crash on GNUstep. Mac wasn't affected. -- what's new in 0.9.0 (25 December 2009) + fixes to build on current glibc and current compilers with optimizations enabled. + new, unified, PRFilter architecture which simplifies all the controllers and unifies parameter passing with an Array + all PRTransform actions (rotations, flips, transposition) now support both color and grayscale and preserve alpha channel + complete update of all filters to support Cocoa >= 10.4 which pads the NSBitmapImageRep rows + faster access to bitmap data by using PRImage instead of recreating the bitmap image rep. Used now pervasively, for example in the custom edge tracer: much faster -- what's new in 0.8.3 (24 August 2008) + performance and memory usage improvments + license is now GPL v2 or later -- what's new in 0.8.2 (20 February 2008) + selectable method for greyscale conversion (rgb average and luminance of YCrCb) + image inversion for both color and greyscale images + in the GNUstep version an interface was corrected since it was corrupted and caused crashes -- what's new in 0.8.1 (5 November 2006) + equalization on the Y coordinate of the YCrCb colorspace -- what's new in 0.8.0 (29 April 2006) + the image representation is now a PRImage class which allows to access some fieds without fetching the TIFF image representation. This yields some speed up in some stages, like when fetching the original dimensions. + the 5x5 convolution engine now works in color mode (separate RGB channels) too + a small fix for the convolve progress panel that wasn't updating properly + median filter has support for color filtering! (separate channel in RGB) + implemented separable linear scaling + implemented copy & paste + faster FFT -- what's new in 0.7.0 (26 June 2006) + fixed a memory release bug that occoured when greyscale images needed to be converted in colorspace on load + new interface for the "zoom" view of an image based on a pop-up button + a small info line at the bottom of the image + fixed zoom scale problem when doing undo/redo (it did always reset to 100%) -- what's new in 0.6.1 (10 June 2005) + automatic window scaling on open + implemented a preference panel + an Icon, finally! There are two versions of it, one for Macos-X and one for GNUstep. -- what's new in 0.6.0 (11 April 2005) + Brightness and Contrast adjustment + histogram fixes -- what's new in 0.5 (02 March 2005) + Scale image added + Crop image added + undo aspect ratio update fixed + many small tweaks in the UI (redesigned some panels, rearranged and relabeled those ugly Ok buttons) -- what's new in 0.4.1 (19 January 2005) + progress display for several filters (low and high pass, convolve, median, custom edge tracer) + Undo fundamentals implemented, one level of image undo is held! + Revert to saved works finally (thanks to the undo and some small fixes) + fixed refresh of transpose, rotate90 and rotate270 -- what's new in 0.4.0 + memory managment clean up (and some leak fixes) + automatic conversion to grayscale for many filters if the image was in color + further work in Custom edge tracer, algorithms now more complete and a third image can be used + improved zero corssing / non zero crossing for the edge tracer(s) -- what's new in 0.3.0 + fixed a bug in the transposition of color images + fixed a bug in the slider of the GNUstep Median filter interface + added image rotation of 90/180/70 degrees + added vertical and horizontal image flipping + fixed some naming in the panel titles -- what's new in 0.2.9 + separate RGB color image equalization implemented + colored display of Histogram and cumulative Hitogram + memory deallocation fixes + implemented zero-cross display for laplacian filters + implemented customizable median filter (different forms and size) + implemented the basis for a more customizable edge tracer + fixed a bug in the DFTHighPass interface on GNUstep -- what's new in 0.2.8 -- + NSImageView works now in gnustep (no more clipping) + edge tracing is implemented (with selectable filters) + fixed a weak comparison for color spaces in MyDocument.m and included the check of both Calibrated and Device color space so it works more reliably across different platforms. -- what's new in 0.2.7 -- + histogram and cumulative histogram display + fixed equalization, but improvment space remains. -- what's new in 0.2.6 -- + DFT low pass now uses a rised cosine for the transition improving the smoothness + the DFT low-pass controller now checks for the input range, also directly entering the numerical values works + rewrote pointer access in the Convolve 5x5 and did some clean up + auto-range for DFT based filters works now much, much better due to a careless bug I had left in -- what's new in 0.2.5 -- + FFT is now displayed shifted with the 0 in the center of the image + the DFT - inverse-DFT of the low and high-pass filters works now great without adding spurious lines. Now the actual filtering part remains to be done correctly. + several GNUstep bugs were solved + DFT based Low and High pass are now skectechd out and roughly functional -- what's new in 0.2.4 -- (26 Oct 2003) + 2D FFT is now displayed in logarithmic scale, to ease visualization + Save works (TIFF output) -- what's new in 0.2.3 -- (13 Oct 2003) + 2D FFT is now usable, although it serves only as display (since only the real part is displayed and it is auto-scaled). But it should work on non square and non-power-of-two image sizes too! + DFT filter at the first (useless) implementation, basically the image is transformed and back-transformed -- what's new in 0.2.2 -- + key order in the convolution matrix is now correct + white and black color spaces are now correctly recongnized, although I don't like my current conversion method. + great FFT progress -- what's new in 0.2.1 -- (1 feb 2003) + manual entering of convolution finally works (and not only when closing and reopening the panel!) + "Auto Scale" correctly enables and disables manual controls, even on reopen. + convolution now works fine, it wraps and mirrors over the edges as it should -- what's new in 0.2 -- (30 jan 2003) + grayscale conversion + first work on the convolution engine + first work on filter preference panels. -- what's new in 0.1 -- (21 dic 2002) + first initial draft, first layouts LIMITATIONS ----------- - currently FFT and convolutions work only on grayscale images LICENSE and DISCLAIMER ----------------------- PRICE Copyright (C) 2002-2011 Riccardo Mottola This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Source: README, updated 2012-04-23

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