Release 1.5.13 (10 Mar 2015) -- compared to 1.5.12)

• oiiotool: Bug fix for frame sequences -- could crash in Windows. #1060
• New ImageOutput::supports() tags: supports("alpha") should be true for image formats that support an alpha channel, supports("nchannels") should be true for output formats that support an arbitrary number of output channels. #1058
• oiiotool: Gracefully handle requests to save an image with more channels than the output file format can handle. Instead of being a fatal error, now it's just a warning, and extra channels are dropped. It tries to to find R, G, B, and A channels, saving them. If those names are not found, it just saves the first 3 (or 4) channels. #1058
• Improved handling of "PixelAspectRatio" for JPEG, TIFF, and OpenEXR. #1042 #1066
• oiiotool: Improve error messages when files can't be read. It is now easier to to distinguish files that don't exist from those that are an unknown format from those that are corrupted or have read errors. #1065
• maketx now writes to a temporary file, then moving it to the final requested output filename only when the write completed without error. This prevents situations where maketx crashes or is killed and leaves behind a file that looks correct but is actually corrupted or truncated. #1072
• Python: added previously-M.I.A. ImageSpec.erase_attribute(). #1063
• Add Filesystem::rename() utility. #1070
• Made TypeDesc::equivalent accept comparisons of arrays of unspecified length with ones of definite length. #1072
• oiiotool & maketx have improved error message when unknown data format names are requested with "-d". #1077
• oiiotool numeric wildcard improvement: allow more digits to match. #1082
• Remove dependency of OpenSSL by default. #1086