Watermarking images with ImageMagick

Protecting your photos and images with watermarking using imagemagick is pretty cool. Aditya talks about watermarking images using text and images with various effects like composite, dissolve and watermark. Nice, comprehensive post! A good read.

The 'Ruby on Rails' Mini Blog

Watermarking images is a breeze with ImageMagick. ImageMagick is a very handy tool to manipulate images from the command-line. It is free and is available on all major platforms.You can use text or another image to watermark your images with ImageMagick. The ‘rmagick‘ gem is a Ruby library to interact with ImageMagick.

I recently had to watermark images in one of my Rails projects. This was pretty critical as some of the customers were using these images without paying for them. Images were generated using ‘pdf2image‘ and not uploaded by the client. So we had to do this with Ruby.

We wanted the watermark to occupy a large part of the image, look pleasant without actually becoming overbearing. We tried both alternatives text and image before choosing to watermark with the client’s logo.

There are many ways to watermark images with either text or another image using ImageMagick’s ‘convert’ tool and command…

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Comparative study of looping construct in ruby, dlang, rust, golang.

Sanjiv has drawn a good raw loop performance comparison between Go, Rust, C and Dlang. Some of the outcomes are pretty fascinating and he predicts that Rust will be a great for low level and system programming while Go will take the lead for general purpose high level languages.

Did you know – In ruby, ‘while’ loop performs much better than ‘for’. It is recommended that when iterating large data,use ‘while’ or ‘loop’ than the traditional each or foreach.


We have been learning & working on various programmings languages. These different programmings language help us to learn various programming paradigm & constructs.  There are number of new programming language such golang, rust, dlang.

We are going to see performance of simple loop in golang, rust, dlang, ruby. We are going iterate a 100 million times to see raw performance. Below is the example of for loop in golang.

Above code is compiled with gccgo-4.9(golang). gccgo compile the given input file & produces binary file with name ‘a.out’.Benchmark of following code:

Below is the example of loop in rust-lang. In rust lang, there are two different looping construct namely ‘for’ and
‘while’ loop. ‘while’ denotes a loop that iterates as long as its given condition.

Above code is compiled with rust(version 0.13).  rustc compile the given input file & produce binary file with name same name as input.Benchmark of following code:


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