I also want to support more images formats like Avif and JpegXL. For instance, I want to work on additional optimizations for the PNG and WebP formats. The project is not finished, there is still a lot to do. I want to thank everyone that gave me feedbacks, tips about image optimization, or pointed me to other interesting library. Note that for security reasons it is important to escape arguments passed to exec with another command like escapeshellcmd or escapeshellarg for security reasons. In order to call external programs from php you use the exec command documented here. To get the possible smallest PNG images, it unites PNGOUT, OptiPNG, and DeflOpt techniques. On there website they recommend trimage for non Mac users. It is suitable for converting GIF, JPEG, BMP, and TIFF image files into PNG format. PNG Gauntlet is a tool specialized in optimizing PNG files and available for windows only. The comments I got on my previous post were very helpful and really allowed me to improve the software. PNG Gauntlet Free Image Compressor software.
Please note that the optimizations done by YOGA are resources heavy, especially for JPEGs (it can take 300 Mo / 3 min per Mpix). Multiselection is now available (multiple files can be selected and their parameters edited at once) The "Stop" button now stops the running optimizations and not only the pending ones Setting the default output locations / name or pattern of output files Number of threads used to optimize images Options :nice Nice level, priority of all used tools with higher value meaning lower priority, in range -20. Temporary directory can be changed using one of TMPDIR, TMP or TEMP environment variables. YOGA can no more output a PNG larger than the input one when performing a PNG to PNG optimization (that used to happen in rare edge cases). imageoptim uses standard ruby library for creating temporary files. JPEG optimization has been improved: up to 7.3 % of additional size reduction since previous version (now JPEGs are first processed by Guetzli and then (losslessly) by MozJPEG)! Now it honors the JPEG orientation EXIF tag (no more image wrongly oriented after being optimized). Besides, I also want to show you that many heap overflow bugs can be exploited in a similar way ALLOWEDEXTENSIONS gif This post describes the exploitation of an off-by-one bug CTF 2019 oob-v8 that only gives you so limited ability So we came 1st in this CTF :) hxp CTF 2017 cloud18 (web. It supports several formats as input and can generate optimized JPEG, PNG and WebP (both lossy and lossless).įirst of all, YOGA, the library that optimizes the images under the hood was also updated. Short presentation: YOGA Image Optimizer is a graphical tool to convert and optimize images (reducing file size). YOGA Image Optimizer v1.1 was released recently and there is a lot of improvements since I first presented the project here!
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