Be aware that sometimes colors are not preserved. If the image is relatively small check the palette (use convert input.png output.xpm).zTXt contains compressed text with the same limits as tEXt.For truecolor and grayscale images, it stores a single pixel value that is to be regarded as fully transparent For indexed images, it stores alpha channel values for one or more palette entries. tRNS contains transparency information.tIME stores the time that the image was last changed.tEXt can store text that can be represented in ISO/IEC 8859-1, with one name=value pair for each chunk.sTER stereo-image indicator chunk for stereoscopic images.sRGB indicates that the standard sRGB color space is used.sPLT suggests a palette to use if the full range of colors is unavailable.sBIT (significant bits) indicates the color-accuracy of the source data.pHYs holds the intended pixel size and/or aspect ratio of the image.iTXt contains UTF-8 text, compressed or not, with an optional language tag.hIST can store the histogram, or total amount of each color in the image.cHRM gives the chromaticity coordinates of the display primaries and white point.It is intended for use when there is no better choice available, such as in standalone image viewers (but not web browsers see below for more details) bKGD gives the default background color.
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