Hello. Recently we wrote about memory problems of PIL while converting large number of png files to 8-bit palette format. After some number of messages simple converting script (see in attach) takes all available memory from a system and produces QuantizationError. After some examinating of PIL source code we've founded that QuantizationError arrises after failed malloc. Each new image increase memory usage, whereas this script should work in fixed amount of memory (it processes image, then takes the next one). I've realized that problem can be solved by applying simple patch (see attach). After tests on huge number of png files memory consumption looks fixed and converting works correct. I'd like to know PIL author's opinion. Thank you.
Evgeny
PIL_mem_leak.diff
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to_8bit.py
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