Question

android version upgrade to 5.x, I got a png image through screenshot. when I use imagemagick to resize it, I got an error like this

identify: Extra compressed data. `a.png' @ warning/png.c/MagickPNGWarningHandler/1777.
identify: Extra compression data. `a.png' @ warning/png.c/MagickPNGWarningHandler/1777.
convert: Extra compressed data. `a.png' @ warning/png.c/MagickPNGWarningHandler/1777.
convert: Extra compression data. `a.png' @ warning/png.c/MagickPNGWarningHandler/1777.

use pngcheck info:

File: a.png (251221 bytes)
chunk IHDR at offset 0x0000c, length 13
1440 x 2560 image, 24-bit RGB, non-interlaced
chunk sBIT at offset 0x00025, length 3
red = 8 = 0x08, green = 8 = 0x08, blue = 8 = 0x08
chunk IDAT at offset 0x00034, length 251149
zlib: deflated, 32K window, maximum compression
chunk IEND at offset 0x3d54d, length 0
No errors detected in a.png (4 chunks, 97.7% compression).

My soft version: ImageMagick 6.7.9-0 PNG* PNG rw- Portable Network Graphics (libpng 1.2.52) See http://www.libpng.org/ for details about the PNG format. PNG24* PNG rw- opaque 24-bit RGB (zlib 1.2.8,1.2.1.2)

I tryed ImageMagick-6.9.1-6 and libpng-1.6.17 zlib-1.2.8, all are newest version, but got error yet

please try this png image , and help me...

http://pan.baidu.com/s/1mg3mkCo

thanks

Answer 1

“额外压缩数据”只是一个警告。你可以忽略它。

“转换”操作的结果应该没问题; ImageMagick不会传播额外的数据。

请注意，“pngcheck”不会解压缩IDAT块，因此它不会报告由于屏幕截图应用程序中的错误而导致的额外数据。

Answer 2

将-quiet选项添加到您的convert或identify命令中，这样您就不会产生错误。

png imagemagick error: Extra compressed data

2 个答案: