error converting tif to pdf

[donswei]

I have tried a few times to no avail, I am getting this error on many files what are the arguments that I use to convert tif files to pdf.

Tif's are the majority of the converts that we need to do.

C:\mytest>magick 2679690.TIF 2679691.TIF ity.pdf
magick: Improper JPEG sampling factors 2,1
Apparently should be 1,1.. `JPEGPreDecode' @ error/tiff.c/TIFFErrors/572.

C:\mytest>magick 2679690.TIF abc.pdf
magick: Improper JPEG sampling factors 2,1
Apparently should be 1,1.. `JPEGPreDecode' @ error/tiff.c/TIFFErrors/572.

[snibgo]

I suggest you provide a link to an input TIF that has the problem.

Please also state the version of IM you use, on what platform.

[donswei]

I am using ImageMagick 7.0.7 Q16 (64-bit) on windows if that helps.

I have to make a tif that I can share. we have sensitive information. I will have someone create one that we can share

[donswei]

the link is to a file that gives us the error is

https://mcphsuniv-my.sharepoint.com/per ... %3a00.000Z

[snibgo]

With older versions of IM (6.9.5-3 and 7.0.3-5), I get a similar message, but as a warning, not an error, and it creates an output.

Code: Select all

f:\web\im>%IM%convert 2679693.TIF x.png
convert.exe: Auto-corrected former TIFF subsampling values [1,1] to match subsampling values inside JPEG compressed data [2,1]. `JPEGFixupTagsSubsamplingSec' @warning/tiff.c/TIFFWarnings/896.

f:\web\im>%IMG7%magick 2679693.TIF x.png
magick: Auto-corrected former TIFF subsampling values [1,1] to match subsampling values inside JPEG compressed data [2,1]. `JPEGFixupTagsSubsamplingSec' @ warning/tiff.c/TIFFWarnings/905.

[donswei]

In this version no pdf is created.

[fmw42]

On IM 7.0.7.8 Q16 Mac OSX, I get the following message and no output.

Code: Select all

magick 2679693.TIF tmp.png
magick: Improper JPEG sampling factors 2,1
Apparently should be 1,1.. `JPEGPreDecode' @ error/tiff.c/TIFFErrors/645.

I note that the TIFF is JPEG encoded and the IM verbose information shows all pixels are 0

Image: 2679693.TIF
Format: TIFF (Tagged Image File Format)
Mime type: image/tiff
Class: DirectClass
Geometry: 2200x1696+0+0
Resolution: 200x200
Print size: 11x8.48
Units: PixelsPerInch
Type: Bilevel
Base type: TrueColor
Endianess: LSB
Colorspace: sRGB
Depth: 8/1-bit
Channel depth:
gray: 1-bit
Channel statistics:
Pixels: 3731200
Gray:
min: 0 (0)
max: 0 (0)
mean: 0 (0)
standard deviation: 0 (0)
kurtosis: -3
skewness: 0
entropy: nan
Colors: 1
Histogram:
3731200: ( 0, 0, 0) #000000 gray(0)
...
Properties:
date:create: 2017-10-26T09:15:26-07:00
date:modify: 2017-10-26T09:15:26-07:00
jpeg:sampling-factor: 1x1
signature: 696ccf469a34023dac0df1c3897cdb6f1da68bafef3f85cdc37b43f164a2f6a5
tiff:alpha: unspecified
tiff:endian: lsb
tiff:photometric: YCBCR
tiff:rows-per-strip: 1696
tiff:software: LibTiff Version 4.0.3

So I conclude the image is corrupt or malformed or perhaps IM cannot handle JPEG encoded TIFF properly.


IM 6.9.9.20 Q16 Mac OSX, creates a totally black PNG

[donswei]

I was able to open the fie in adobe fine. so at least adobe can open the file.

[fmw42]

As a test, try importing the TIFF file into Photoshop or GIMP and export again with lzw or zip or no compression and again with JPG compression. Then convert them with ImageMagick and see if that works. I suspect the JPG 1:1 compression from wherever you got the TIFF file.

I can open the TIFF file in GIMP, but it says it is correcting the compression from 1:1 to 2:1. So I suspect that is the issue. Change the compression in some other tool so that the subsampling is 2:1.

Using GIMP to correct the file and exporting again as TIFF with JPG compression, then IM 7 opens and converts and saves the file with no problem.

[donswei]

We tried that one one file, we exported on each lzw, zip, jpg and saved the file,
IM worked fine on each one . I can resave a few files so the conversion works for them but I have hundreds of files.
to me and others this shows IM should be able to handle the issue since photoshop worked.

I will start looking into how the files are saved to see if we can fix it going forward.

[fmw42]

The problem is that it seems other programs like GIMP recognize that the format is non-standard and fix it. IM is apparently just checking and does giving an error without fixing it. This is not a bug per se, but a feature enhancement that you may need to ask about implementing. The bug is how the file was created. The IM developers will need to look into this to see if something can be done.

[donswei]

we are seeing this in a fair amount of files and not sure if we can even fix it. we have scanners creating the tiff files, so getting them to adjust might be difficult.
how do we get someone to look into this?
and possibly fix this?

[fmw42]

Use the "contact us" button at the bottom of the forum to send a message to the IM developers to look into it.

[donswei]

I did the contact us twice and got no response.
I can do it a third time but I think the result will be the same.
we really need this fixed, how do we go about getting this updated?

[fmw42]

I sent a message to the IM developer to review this issue.