I have a logo in .PDF format CMYK, how do I apply this to the HTML/PHP page and include it in the final generated PDF-document?
I know I can include .png image, but it wont turn out well on print.
Related
I have used {width=25px} for inline image but it seems not working with .svg image.
Is there any way that I can use this image in my rmarkdown?
You could use the R package rsvg to convert the SVG to PDF
rsvg::rsvg_pdf(svg = "https://upload.wikimedia.org/wikipedia/commons/1/15/Florida_in_United_States.svg",
file = "image.pdf")
and then include that PDF as you're used to
{width=25px}
You could also convert the SVG to another image format supported by knitr using the other rsvg::rsvg_* converter functions, e.g. to PNG via rsvg::rsvg_png(). But I'd recommend to stick with vector image formats like PDF or EPS since they will print in crisp sharpness.
Note that if you install rsvg from source (likely the case on Linux), additional system dependencies are required.
Enhancing in-house/internal software, that creates very basic PDF files, to handle images. Using JPEG seems to be the easiest place. Inserting JPEG image into Xobject stream by opening Image file and performing Reads from image file and Writes into PDF file. However, when viewing PDF file, getting errors on Image length. Appears PDF JPEG Image stream contents is not the exact same format as the Image file itself. I'm not using any PDF development tools to build the PDF file, just developing code myself to do this.
Does anyone know exactly how to add JPEG image file contents into Xobject stream? Appears to be or needs to be a conversion or something.
I'm trying to create a small PDF file, embedding one optimized PNG image displayed as a header and footer on a 3 page PDF (same image must appear 6x in the PDF)
My optimized PNG image is only 2.3KB. It looks very sharp.
Failed with libreoffice
When I insert just one instance of the 2.3KB PNG image into a Libreoffice Writer doc containing only text, then export as PDF I can see that the image gets re-compressed to JPG and the resulting PDF file grows by about 40KB after adding the image. It also loses quality, the PNG also gets JPG fuzzy edges.
If I right click the image and select compression, there is no way to disable recompressing the image (it's already optimized better than libreoffice could do it) I've tried setting a compression level of 0,1,9 etc. Choosing JPG, no resize, lossless, etc but there was no improvement.
Failed with wkhtmltopdf
I also tried making a test page and used wkhtml2pdf but it did the same thing. Adding the low quality flag made no difference.
PDF Spec suggests PNG is supported?
From skimming the PDF spec, it looks like PNG images are supported.
Even plain text PDF files are surprisingly large
The disappointing thing is also when I take a 7KB HTML file which is basically just <html><body><p>foo...</p><p>bar...</p> (only about 15 paragraphs) with no CSS. The resulting 2 page PDF file is 30KB. Why should a 7kb (almost plain text) file become 30kb as a PDF?
Suggestions?
Can someone please suggest how to make a small PDF file in Linux?
I need to include 7KB of text and repeat one PNG image 6 times.
Manually or programatically. I'll take whatever I can get at this point.
PDF Spec suggests PNG is supported?
PNG isn't supported per se; PDF allows embedding JPEG images as-is, but not PNG images. PDF does borrow a set of features of the PNG format, however.
rinohtype (full disclosure: I'm the author) tries to embed as much as possible from PNG images as-is into the PDF. This does involve some bit-juggling to separate the alpha channel from the color data for example, but no reencoding of the image is performed. It does not (yet) support interlaced PNGs.
rinohtype should be able to do what you want to achieve. But please note that it currently is in a beta stage, so you might encounter some bugs.
Even plain text PDF files are surprisingly large
To keep the PDF size as small as possible, make sure not to embed/subset any of the fonts. Use only the fonts from the base 14 PDF fonts which are provided by PDF readers.
What you want is certainly achievable. Regarding the image quality, I would recommend making your image twice the size that you want it to actually display at in the PDF to keep it looking sharp.
As to the size, I've just modified a test in my PDF writer module (WIP..) to include a 7.2K png, 200px x 70px, in a PDF twice and the PDF came out at 6.8K 8). There's not much text included, but more text will only add what it's worth + a small percentage.
You can see the module and original test here.. https://github.com/DoccaPDF/docca-pdf-writer/blob/master/src/tests/writer.js#L40
That test adds ~112K of images to the PDF and results in a 103K PDF.
Of course not all images are created equal so you milage may vary..
*the images are only actually added to the PDF once, but are displayed multiple time.
I'm seeing some images online that end in .png but appear as GIF. How is this possible?
Example:
https://www.khanacademy.org/computer-programming/loading/6267221601681408/5689792285114368.png
This is a GIF file, with an .png extension. Though the extension is "wrong", many image viewers (including browsers) can still it interpret them correctly because they don't believe blindly what the extension says (remember that the "extension" is just a hint), but they look into the image content. The first bytes of most common image formats allow to easily identify the image type. In this case, you can check (looking at the image content, say, in some hexadecimal editor/viewer) that the file content starts with the ASCII characters "GIF89a".
I'm doing a document scanning project that involves inserting a scanned image into an existing PDF template page that contains form fields. I've used ImageMagick to take process the scan, and then append a raster image of the form template to the bottom, and convert that image into a PDF. However, forms and checkbox fields have to be added manually to the resulting PDF. Below is a sample of my ImageMagick command.
convert inputScan.jpg -resize 975x420 FormTemplate.png -append CombinedFile.pdf
Ideally, I would run a command that would take the JPG scan and the PDF template file containing fields, and output a PDF file with the scan at the top of a page and the field-containing template text below it. The closest thing I could find to a solution was here, but PHP can't be used on the computer in question.
Any help or suggestions are greatly appreciated!