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Questions tagged [watermark]

A watermark is information embedded within a file. In the most common usage, watermarks are added to images to identify the image's creator.

Digital watermarks may be used to verify the authenticity or integrity of the carrier signal or to show the identity of its owners. It is prominently used for tracing copyright infringements and for banknote authentication.

Like traditional watermarks, digital watermarks are only perceptible under certain conditions, i.e. after using some algorithm, and imperceptible anytime else.

In contrast to a , watermarks can typically easily be added by a third party. A watermark can be forged, but should typically be hard to remove.

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Is it possible in Ghostscript to add watermark to every page in PDF

I convert PDF -> many JPEG and many JPEG -> many PDF using ghostscript. I need to add watermark text on every converted JPEG (PDF) page. Is it possible using only Ghostscript and PostScript? The only way I found: gswin32c -q -sDEVICE=pdfwrite…
radistao
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Applying watermarks on pdf files when users try to download the files

The solutions for my school's assignments all have waterstamps on the PDFs with our username on it. I was wondering if you guys know how to do something like that using PHP? Do they run a script prior to the download process? Thanks.
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ffmpeg text watermark bottom left

I have found out how ffmpeg can add image watermark at the bottom left of a video ffmpeg -i "C:\test.mp4" -i "C:\test\watermark.png" -filter_complex "overlay=10:main_h-overlay_h-10" "C:\test-watermark.mp4" but I am looking for a way to add text…
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How to get an image watermark in HighCharts charts?

I am using HighCharts Javascript library for a web application and would like to have an image watermark inside the charts (let's say a small image on the left top corner). Not only to show this watermark image in the browser, but also when someone…
Glooh
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Adding a watermark to a canvas that already has an image - HTML5, Canvas

I have a camera video feed and a canvas. The canvas takes the image of the feed when user clicks Submit
Cody Raspien
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adding a watermark image to an image

I want to add a small, kind of fading out watermark image to all my images. is there a way to do this in c#?
mrblah
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iPhone AVErrorInvalidVideoComposition error when doing image overlay on video?

I have combined the 2 code chunks found here into one solid chunk (and verified the process with an Apple Developer Xcode tutorial file). When I run it, however, I get an error. It says: Error Domain=AVFoundationErrorDomain Code=-11841 "The…
Christian Reich
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How to watermark images uploaded into S3

We would like to watermark images automatically, after its uploaded to S3. How do we achieve this using a java based library?
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Flink Windows Boundaries, Watermark, Event Timestamp & Processing Time

Problem Definition & Establishing Concepts Let’s say we have a TumblingEventTimeWindow with size 5 minutes. And we have events containing 2 basic pieces of information: number event timestamp In this example, we kick off our Flink topology at…
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How to overlay an image/watermark with pure CSS and HTML

Is there an easy way with relative positioning to overlay a transparent PNG (or any other image) over an image tag with CSS just by passing a class? Photo Then the CSS might be…
techtheatre
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Watermarking video from the Linux command line

does anyone know how to watermark video from the Linux command line using a simple tool? Watermarking in ffmpeg isn't supported in the current version, and requires a custom compile. Max.
user7289
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Watermark Removal on PDF with PyPDF2

# This Section imports the necessary classes from the PyPDF2 library from PyPDF2 import PdfFileReader, PdfFileWriter from PyPDF2.generic import ContentStream, NameObject, TextStringObject from PyPDF2.utils import b_ # The watermark says SAMPLE on…
Shane G.
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using putText() diagonally? Using OpenCV

Is it possible using the putText() method to draw text on a picture diagonally? If not, beside using addWeighted() to blend two pictures together (where one of them is a text placed diagonally), is there any other option? I'm trying to place a text…
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Javascript "watermarks" for textboxes

I would like to know how to put text in a textbox when the page loads. Example: If I have a login page, I would have 2 textboxes named "username" and "password". When the page loads I want the the textbox to load with "username" written inside, so I…
sin
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jQuery watermarkinput plugin POSTs watermark values to server

I'm using the jQuery watermarkinput plugin to place hint text inside text box input fields. When the page POSTs back to the server, the watermark values are POSTed as the input box values. How do I prevent the watermark values from being POSTed?
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