我知道我可以创建一个基于 Qt 的简单应用程序,使用 QImage.setText(...) 和 QImage.text(...) 添加和读取 png 元数据。然后可以使用名为 pngmeta 的 Linux 命令读取该元数据。
但是我可以使用哪些其他图像软件来读取 png 元数据?
请注意,我正在寻找适用于常见平台的图像程序,因此请说明您的应用程序是适用于 Windows 还是 Linux。
为了使问题更清楚,我附加了一张带有一些测试元数据的图片。
谢谢 Johan
链接:
答案1
使用ImageMagick
:
identify -verbose image.png
ImageMagick
应该是跨平台的。我在 Linux 上用你附加的图片试过了:
[...] 特性: 作者:汉斯·穆勒 日期:2010-12-08 09:45 日期:创建:2010-12-08T13:15:43+01:00 日期:修改:2010-12-08T13:15:43+01:00 描述:很久以前,在一个遥远遥远的星系...... 签名:3b4a54202316a7ae4b4fe0e431d47958181f4bb893493355820d4ba74f9f5ee3 [...]
答案2
另一个选择是调整PNG在 Windows 上。
我发现在显示Hans Müller
图像中的名称时遇到了问题,所以也许它不适用于 Unicode 元数据。
答案3
如果您正在寻找仅限 PNG 的解决方案,请尝试pngchunks
:
$ sudo apt-get install pngtools
$ pngchunks UiagX.png
Chunk: Data Length 13 (max 2147483647), Type 1380206665 [IHDR]
Critical, public, PNG 1.2 compliant, unsafe to copy
IHDR Width: 800
IHDR Height: 600
IHDR Bitdepth: 8
IHDR Colortype: 2
IHDR Compression: 0
IHDR Filter: 0
IHDR Interlace: 0
IHDR Compression algorithm is Deflate
IHDR Filter method is type zero (None, Sub, Up, Average, Paeth)
IHDR Interlacing is disabled
Chunk CRC: 353637671
Chunk: Data Length 9 (max 2147483647), Type 1935231088 [pHYs]
Ancillary, public, PNG 1.2 compliant, safe to copy
... Unknown chunk type
Chunk CRC: 10132504
Chunk: Data Length 19 (max 2147483647), Type 1951942004 [tEXt]
Ancillary, public, PNG 1.2 compliant, safe to copy
... Unknown chunk type
Chunk CRC: -1325924661
Chunk: Data Length 21 (max 2147483647), Type 1951942004 [tEXt]
Ancillary, public, PNG 1.2 compliant, safe to copy
... Unknown chunk type
Chunk CRC: 134517081
Chunk: Data Length 58 (max 2147483647), Type 1951945850 [zTXt]
Ancillary, public, PNG 1.2 compliant, safe to copy
... Unknown chunk type
Chunk CRC: 1701487776
Chunk: Data Length 572939 (max 2147483647), Type 1413563465 [IDAT]
Critical, public, PNG 1.2 compliant, unsafe to copy
IDAT contains image data
Chunk CRC: 1174233759
Chunk: Data Length 0 (max 2147483647), Type 1145980233 [IEND]
Critical, public, PNG 1.2 compliant, unsafe to copy
IEND contains no data
Chunk CRC: -1371381630
输出pnginfo
可能不够详细,不符合您的使用要求:
$ pnginfo UiagX.png
UiagX.png...
Image Width: 800 Image Length: 600
Bitdepth (Bits/Sample): 8
Channels (Samples/Pixel): 3
Pixel depth (Pixel Depth): 24
Colour Type (Photometric Interpretation): RGB
Image filter: Single row per byte filter
Interlacing: No interlacing
Compression Scheme: Deflate method 8, 32k window
Resolution: 2835, 2835 (pixels per meter)
FillOrder: msb-to-lsb
Byte Order: Network (Big Endian)
Number of text strings: 3 of 9
Author (tEXt uncompressed): Hans Müller
Date (tEXt uncompressed): 2010-12-08 09:45
Desc (tEXt uncompressed): A long time ago in a galaxy far far away....
答案4
pngcheck -c -v -t foobar.png
这些是显示 PNG 块的相关选项:
-7 print contents of tEXt chunks, escape chars >=128 (for 7-bit terminals)
-c colorize output (for ANSI terminals)
-p print contents of PLTE, tRNS, hIST, sPLT and PPLT (can be used with -q)
-t print contents of tEXt chunks (can be used with -q)
-v test verbosely (print most chunk data)