Imagemagick: generate raw image data for PDF flate embedding?
我正在尝试提出一个命令行、PDF 源代码示例(另请参阅如何生成在文档查看器中工作的纯文本源代码 PDF 示例?),但嵌入了一个图片。这就是我得到的程度 - 我有一个模板
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 | %PDF-1.4 1 0 obj << /Type /Catalog /Outlines 2 0 R /Pages 3 0 R >> endobj 2 0 obj << /Type /Outlines /Count 0 >> endobj 3 0 obj << /Type /Pages /Kids [ 4 0 R ] /Count 1 >> endobj 4 0 obj << /Type /Page /Parent 3 0 R /MediaBox [ 0 0 612 792 ] /Contents 5 0 R /Resources << /ProcSet 6 0 R /Font << /F1 7 0 R >> /ProcSet [ /PDF /Text /ImageC ] /XObject << /Im1 8 0 R >> >> >> endobj 5 0 obj << /Length 173 >> stream BT /F1 24 Tf 100 100 Td ( Hello World ) Tj 200 200 Td ( Hello Again ) Tj % width skew-right-up skew-top-right height x y 150 0 0 150 340 130 cm % 150 150 Td - irrelevant for image /Im1 Do ET endstream endobj 6 0 obj [ /PDF /Text ] endobj 7 0 obj << /Type /Font /Subtype /Type1 /Name /F1 /BaseFont /Helvetica /Encoding /MacRomanEncoding >> endobj 8 0 obj << /BitsPerComponent 8 /ColorSpace /DeviceRGB /DecodeParms << /BitsPerComponent 8 /Colors 3 /Columns 150 /Predictor 10 >> /Filter [ /FlateDecode ] /Height 150 /Length 1418 /Subtype /Image /Type /XObject /Width 150 >> stream ###endstream endobj 9 0 obj [ /PDF ] endobj xref 0 10 0000000000 65535 f 0000000009 00000 n 0000000074 00000 n 0000000120 00000 n 0000000179 00000 n 0000000364 00000 n 0000000466 00000 n 0000000496 00000 n 0000001000 00000 n 0000001100 00000 n trailer << /Size 10 /Root 1 0 R >> startxref 625 %%EOF |
然后,我使用
1 2 3 4 | convert -size 150x150 gradient:\\#4b4-\\#bfb test.ppm du -b test.ppm # 135017 bytes python -c"import zlib,sys;sys.stdout.write(zlib.compress(sys.stdin.read()))" < test.ppm > test.flate du -b test.flate # 1418 bytes |
然后,我替换文件中的
替换标记
1 | perl -ne 's/^###/`cat test.flate`/e;print' hello.pdf > hello2.pdf |
这个文件显然有不正确的外部参照表,但是,在
... 但是,很明显位图格式不正确。
我也尝试过生成,比如说,
1 | convert -size 150x150 gradient:\\#4b4-\\#bfb -endian LSB rgb:test.raw |
...但那些甚至不是一般的绿色(原始图像应该是)。
有谁知道正确的图像格式 - 以及
非常感谢您提供任何答案,
干杯!
好的,修好了;问题是必须在
1 | convert -depth 8 -size 150x150 gradient:\\#4b4-\\#bfb rgb:test.raw |
然后我们有:
1 2 3 4 5 6 7 | du -b test.raw # 67500 bytes python -c"import zlib,sys;sys.stdout.write(zlib.compress(sys.stdin.read()))" < test.raw > test.flate du -b test.flate # 664 bytes # replace /Length 664, and then: perl -ne 's/^###/`cat test.flate`/e;print' hello.pdf > hello2.pdf |
最后,
顺便说一句,我发现这个是因为我实际上是在尝试调试另一个文档中的图像;所以我基本上做了以下事情:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | # extract and save the stream of this image object qpdf --show-object=23 --raw-stream-data mybadfile.pdf > myraw.file # get raw binary data - deflate the saved object stream python -c"import zlib,sys;sys.stdout.write(zlib.decompress(sys.stdin.read()))" < myraw.file > myraw.deflate identify myraw.deflate # identify: no decode delegate for this image format `myraw.deflate' @ constitute.c/ReadImage/530. identify rgb:myraw.deflate # identify: Must specify image size `myraw.deflate' @ rgb.c/ReadRGBImage/155. identify -size 588x508 rgb:myraw.deflate # rgb:myraw.deflate=>myraw.deflate RGB 588x508 588x508+0+0 16-bit TrueColor DirectClass 875KiB 0.020u 0:00.030 # identify: Unexpected end-of-file `myraw.deflate': No such file or directory @ rgb.c/ReadRGBImage/261. display -size 588x508 rgb:myraw.deflate # display: Unexpected end-of-file `myraw.deflate': No such file or directory @ rgb.c/ReadRGBImage/261. ### but it shows correctly, except for size? identify -depth 8 -size 588x508 rgb:myraw.deflate # rgb:myraw.deflate=>myraw.deflate RGB 588x508 588x508+0+0 8-bit TrueColor DirectClass 875KiB 0.020u 0:00 ## OK display -depth 8 -size 588x508 rgb:myraw.deflate # OK; choosing rgba: is already bad - so confirmed 8-bit rgb |
希望这对某人有所帮助,
干杯!