If i render a pdf with a png file, i get the following error.
What's the problem with this?
Warning
Message: imagepng(/...examplepathfolder.../tmp/__tcpdf_172a5566d5e348eba254a398c0909340_imgmask_alpha_2e51083373b9767f3e6183dfb1d0d48e): failed to open stream: No such file or directory
Filename: tcpdf/tcpdf.php
it seems that is a problem with a transparent png file if i try the same with a jpeg there is no error.
There is an example to work with transparent files, https://tcpdf.org/examples/example_042/
For me i wont't understand what i have to change with my code
$info_left_column .= pdf_logo_url();
$pdf->MultiCell(($dimensions['wk'] / 2) - $dimensions['lm'], 0, $info_left_column, 0, 'J', 0, 0, '', '', true, 0, true, true, 0);
pdf_logo_url() returns the absolute path of the png file.
omg i found the problem.
So, under normal use the temp-folder ("K_PATH_CACHE") is not in use for tcpdf. If you use a png the temp-folder is important to create a second image to prepare problems with the alpha-channel.
So, in my installation was a wrong temp-folder, so i changed it and now all works fine :-)
As I showed in the picture, just uncomment this line:
//define ('K_PATH_CACHE', '/tmp/');
Related
I am working on Rails 6 API where I need to generate the QR code image and save that image to S3 using active_storage.
I am using rqrcode gem for this which gives me the SVG string. How can I convert the SVG string into the image and store that image to S3 using active_storage?
Following is my code
Controller
qrcode = RQRCode::QRCode.new("#{#order.id}")
svg = qrcode.as_svg(
offset: 0,
color: '000',
shape_rendering: 'crispEdges',
module_size: 6,
standalone: true
)
I should also generate the png image using
png = qrcode.as_png(
bit_depth: 1,
border_modules: 4,
color_mode: ChunkyPNG::COLOR_GRAYSCALE,
color: 'black',
file: nil,
fill: 'white',
module_px_size: 6,
resize_exactly_to: false,
resize_gte_to: false,
size: 120
)
But while storing I got the following error
ArgumentError (Could not find or build blob: expected attachable, got <ChunkyPNG::Image 120x120 [
Looking for a way to generate the image from the svg string or png file.
Thanks.
note: frontend is react-native
I was able to achieve this by following the answer here.
In short, after you generate the png, you can attach it to your model like so:
#model.qr_code.attach(io: StringIO.new(png.to_s), filename: "filename.png")
I use PythonMagick in my project. When i convert SVG to JPG in command line like "convert x.svg x.jpg" it's ok. When i use PythonMagick i get all black image. I'm confused cuz i have that error only at 2 of 4 computers. They all have approximately similar libraries and OS ubuntu 16-18. Maybe someone can give me some tips what i do wrong. Here is my code.
tmp = tempfile.NamedTemporaryFile(delete=False)
blob = PythonMagick.Blob()
img = PythonMagick.Image('x.svg')
img.composite(img, 0, 0, PythonMagick.CompositeOperator.SrcOverCompositeOp)
img.write(blob, 'jpg')
tmp.write(blob.data)
I'm running an \Imagick::resizeImage() on a png file, and the result is TRUE, but nothing is happening to the image. No errors at all.
Here is my code:
$imagick = new \Imagick("/var/www/silex.dev/uploads/media/test.png");
$status = $imagick->resizeImage(200, 200, \Imagick::FILTER_CATROM, 1);
//$status = true
test.png exists. It has 0777, the media/ folder has 0777 and the uploads/ folder has 0777. It just simply isn't resizing.
I have also run:
if( class_exists('\Imagick') )
which resolves true also.
Here's a screenshot of the file properties, the test.png and its file path.
Does anyone know if I am missing something?
Many Thanks
You need to either save the file or send it to a browser to see the resized version. Imagick doesn't alter files in place.
So either $imagick->writeImage("./output.png") or echo $imagick->getImageBlob();.
TJvDBImage is a good component that support several picture formats. In JvJVCLUtils, it mentioned that the supported format can be expanded by RegisterGraphicSignature procedure. In the comment it mentioned :
WHAT IT IS:
These are helper functions to register graphic formats than can
later be recognized from a stream, thus allowing to rely on the actual
content of a file rather than from its filename extension.
This is used in TJvDBImage and TJvImage.
IMAGE FORMATS:
The implementation is simple: Just register image signatures with
RegisterGraphicSignature procedure and the methods takes care
of the correct instantiation of the TGraphic object. The signatures
register at unit's initialization are: BMP, WMF, EMF, ICO, JPG.
If you got some other image library (such as GIF, PCX, TIFF, ANI or PNG),
just register the signature:
RegisterGraphicSignature(<string value>, <offset>, <class>)
or
RegisterGraphicSignature([<byte values>], <offset>, <class>)
This means:
When <string value> (or byte values) found at <offset> the graphic
class to use is <class>
For example (actual code of the initialization section):
RegisterGraphicSignature([$D7, $CD], 0, TMetaFile); // WMF
RegisterGraphicSignature([1, 0], 0, TMetaFile); // EMF
RegisterGraphicSignature('JFIF', 6, TJPEGImage);
You can also unregister signature. IF you want use TGIFImage instead of
TJvGIFImage, you can unregister with:
UnregisterGraphicSignature('GIF', 0);
or just
UnregisterGraphicSignature(TJvGIFImage); // must add JvGIF unit in uses clause
then:
RegisterGraphicSignature('GIF', 0, TGIFImage); // must add GIFImage to uses clause
I follow the instruction and Added GIFImage in the uses clause at that unit. Also, in procedure GraphicSignaturesNeeded I added :
RegisterGraphicSignature('GIF', 0, TGIFImage);
RegisterGraphicSignature([$4D, $4d, 0, $2A], 0, TWICImage); // TIFF
RegisterGraphicSignature([$49, $49, $2A, 0], 0, TWICImage); // TIFF
The TIFF info is based on
Tip: detecting graphic formats
Then I used the makemodified.bat to re-compile JVCL.
Before the change, loading image to the TJvDBImage will load the file and give endless error of "bitmap image not valid". After change, it refuse to load the file and give the same error for 1 time.
If I load GIF / TIFF image to the field using other tools, when displaying , it give endless error mentioned above. If I load the field content using the above link functions, it can display in a TImage perfectly.
So, what have I missed or doing wrong?
Thank you!
OpenCV says something like
Corrupt JPEG data: premature end of data segment
or
Corrupt JPEG data: bad Huffman code
or
Corrupt JPEG data: 22 extraneous bytes before marker 0xd9
when loading a corrupt jpeg image with imread().
Can I somehow catch that? Why would I get this information otherwise?
Do I have to check the binary file on my own?
OpenCV (version 2.4) does not overwrite the basic error handling for libjpeg, making them 'uncatchable'. Add the following method to modules/highgui/src/grfmt_jpeg.cpp, right below the definition of error_exit():
METHODDEF(void)
output_message( j_common_ptr cinfo )
{
char buffer[JMSG_LENGTH_MAX];
/* Create the message */
(*cinfo->err->format_message) (cinfo, buffer);
/* Default OpenCV error handling instead of print */
CV_Error(CV_StsError, buffer);
}
Now apply the method to the decoder error handler:
state->cinfo.err = jpeg_std_error(&state->jerr.pub);
state->jerr.pub.error_exit = error_exit;
state->jerr.pub.output_message = output_message; /* Add this line */
Apply the method to the encoder error handler as well:
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = error_exit;
jerr.pub.output_message = output_message; /* Add this line */
Recompile and install OpenCV as usual. From now on you should be able to catch libjpeg errors like any other OpenCV error. Example:
>>> cv2.imread("/var/opencv/bad_image.jpg")
OpenCV Error: Unspecified error (Corrupt JPEG data: 1137 extraneous bytes before marker 0xc4) in output_message, file /var/opencv/opencv-2.4.9/modules/highgui/src/grfmt_jpeg.cpp, line 180
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
cv2.error: /var/opencv/opencv-2.4.9/modules/highgui/src/grfmt_jpeg.cpp:180: error: (-2) Corrupt JPEG data: 1137 extraneous bytes before marker 0xc4 in function output_message
(I've submitted a pull request for the above but it got rejected because it would cause issues with people reading images without exception catching.)
Hope this helps anyone still struggling with this issue. Good luck.
It could be easier to fix the error in the file instead of trying to repair the loading function of OpenCV. If you are using Linux you can use ImageMagick to make reparation to a set of images (is usual to have it installed by default):
$ mogrify -set comment 'Image rewritten with ImageMagick' *.jpg
This command changes a property of the file leaving the image data untouched. However, the image is loaded and resaved, eliminating the extra information that causes the corruption error.
If you need more information about ImageMagick you can visit their website: http://www.imagemagick.org/script/index.php
You cannot catch it if you use imread(). However there is imdecode() function that is called by imread(). Maybe it gives you more feedback. For this you would have to load the image into memory on your own and then call the decoder.
It boils down to: You have to dig through the OpenCV sources to solve your problem.
i had to deal with this recently and found a solution over here
http://artax.karlin.mff.cuni.cz/~isa_j1am/other/opencv/
i just need to make 2 edits # $cv\modules\highgui\src\grfmt_jpeg.cpp.
--- opencv-1.0.0.orig/otherlibs/highgui/grfmt_jpeg.cpp 2006-10-16 13:02:49.000000000 +0200
+++ opencv-1.0.0/otherlibs/highgui/grfmt_jpeg.cpp 2007-08-11 09:10:28.000000000 +0200
## -181,7 +181,7 ##
m_height = cinfo->image_height;
m_iscolor = cinfo->num_components > 1;
- result = true;
+ result = (cinfo->err->num_warnings == 0);
}
}
## -405,8 +405,9 ##
icvCvt_CMYK2Gray_8u_C4C1R( buffer[0], 0, data, 0, cvSize(m_width,1) );
}
}
- result = true;
+
jpeg_finish_decompress( cinfo );
+ result = (cinfo->err->num_warnings == 0);
}
}
I am using opencv python package to read some image and also met this error message. This error can not be catch by Python. But if you want to find which image is corrupted without recompiling opencv as #Robbert suggested, you can try the following method.
First, you can pinpoint the directory where the corrupt images reside, which is fairly easy. Then you go to the directory, and use mogrify command line tool provided by ImageMagick to change the image meta info, as suggest by #goe.
mogrify -set comment "errors fixed in meta info" -format png *.jpg
The above command will convert the original jpg image to png format and also clean the original image to remove errors in meta info. When you run mogrify command, it will also output some message about which image is corrupted in the directory so that you can accurately find the corrupted image.
After that, you can do whatever you want with the original corrupted jpg image.
Any one stumbles upon this post and reads this answer.
I had to get hold of a corrupted image file.
These websites can help you corrupt your file
Corrupt a file - The file corrupter you were looking for!
CORRUPT A FILE ONLINE
Corrupt my File
First and the third website was not that much useful.
Second website is interesting as I could set the amount of file that I need to corrupt.
OpenCV version I used here is 3.4.0
I used normal cv2.imread(fileLocation)
fileLocation Location of corrupted image file
OpenCV didn't show any error message for any of the corrupted files used here
First and Third website only gave one file and both had None stored in them, when I tried to print them
Second website did let me decide the amount of file that was needed to be corrupted
Corruption% Opencv message on printing the image
4% None
10% None
25% None
50% None Corrupt JPEG data: 3 extraneous bytes before marker 0x4f
75% None Corrupt JPEG data: 153 extraneous bytes before marker 0xb2
100% Corrupt JPEG data: 330 extraneous bytes before marker 0xc6 None
I guess the only check we have to make here would be
if image is not None:
Do your code or else pop an error
You can redirect stderr to a file, then after imread, search for the string "Huffman" inside that file. After searching the file, empty it. It works for me and now I am able to discard corrupted images and just process good ones.
If you load your image with imdecode, you can check errno :
std::vector<char> datas();
//Load yout image in datas here
errno = 0;
cv::Mat mat = cv::imdecode(datas, -1);
if (errno != 0)
{
//Error
}
(tested on OpenCV 3.4.1)
I found that the issue is in libjpeg. If OpenCV uses it, it gets error
Corrupt JPEG data: 22 extraneous bytes before marker 0xd9
You can try my solution to solve it. It disables JPEG during compilation. After that OpenCV cannot read/write, but it works.
cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D WITH_JPEG=OFF -D WITH_IPP=OFF ..
I found an easy solution without the need to recompile openCV.
You can use imagemagick to detect the same errors, however it returns an error as expected. See the description here: https://stackoverflow.com/a/66283167/2887398