mcanthony/xbrzscale

Image upscaling commandline tool using xBRZ algorithm

xBRZ upscaling commandline tool

Copyright (c) 2014 Przemysław Grzywacz [email protected]

This file is part of xbrzscale.

xbrzscale 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, either version 3 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, see http://www.gnu.org/licenses/.

Overview

This tool allows you to scale your graphics with xBRZ algorithm, see http://en.wikipedia.org/wiki/Image_scaling#xbr_family

This is an example of what xBRZ can do:

External code

The following external code is included in this repository:

• http://sourceforge.net/projects/hqmame/files/ - xBRZ implementation
• https://github.com/TheWatcher/SDL_imagesave - PNG saving

Dependencies

The following dependencies are needed to compile xbrzscale:

• libsdl1.2-dev
• libpng12-dev
• libsdl-image1.2-dev

Mabe some additional libraries are needed. I'm sure you'll figure it out.

Compiling

Just run make and you should end up with a binary called xbrzscale.

The makefile will probably work only on linux, but it is simple enough to be ported to other platforms.

Usage

`xbrztool scale_factor input_image output_image`

• scale_factor - Controls how much your image should be scaled. It should be an integer between 2 and 5 (inclusive).
• input_image - Input image is the filename of the image you want to scale. Image format can be anything that SDL_image supports.
• output_image - Filename where the scaled image should be saved. The only supported format is PNG!

Please note I only tested the scaling on 32bit RGBA PNGs, I have no idea if this will work with 8bit indexed images.