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Thanks for your answer ! Imager and PDL are nice modules. I did not know them up to now. Really worth to invest some time. It took me a while to install Imager. The problem was that the libpng was missing ..... But now its running. $data =~ tr/\0\377/01/; can be removed, if the ascii code is already used in the "if" of transform2: 49 48 if I could not manage to install PDL yet. Prerequisite 'Module::Compile' is not passing for WIN 10 (report). Only one test is failing.(data1_t). Any idea what I could do here ? Force install ? I saw also minor differences in the output of my code and yours. I guess that the decoding of the PNG is done minor differently in the different modules. I have to read more about png coding if this idea can be true or compare the color at some dedicated pixels. In reply to Re^2: working with png data
by Anonymous Monk
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