![]() ![]() If we change the leftmost bit it will have a large impact on the final value. The leftmost bit is the most significant bit. The main purpose of the RGB color model is for the sensing, representation and display of images in electronic systems, such as televisions and computers, though it has also been used in conventional photography. The name of the model comes from the initials of the three additive primary colors, red, green, and blue. The RGB color model is an additive color model in which red, green and blue light are added together in various ways to reproduce a broad array of colors. As you can imagine, the RGB color model has 3 channels, red, green and blue. Here, we will work with the RGB color model. In color imaging systems, a color is typically represented by three or four component intensities such as red, green, and blue, or cyan, magenta, yellow, and black. It means, more samples provide more accurate representations of the original. So, each pixel is a sample of an original image. Pixel concept and color modelsĪs already mentioned, pixels are the smallest individual element of an image. You can read more about digital images, raster graphics, and bitmaps at the Wikipedia website. When using the “ digital image” term here, we are referencing to the “ raster graphics”, which are basically a dot matrix data structure, representing a grid of pixels, which in turn can be stored in image files with varying formats. So we can think of an image as a matrix (or a two-dimensional array) of pixels which contains a fixed number of rows and columns. Pixels are the smallest individual element of an image, holding values that represent the brightness of a given color at any specific point. We can describe a digital image as a finite set of digital values, called pixels. Ok, now that we know the basics of steganography, let’s learn some simple image processing concepts.īefore understanding how can we hide an image inside another, we need to understand what a digital image is. On the other hand, the hidden message is easier to extract. In other words, steganography is more discreet than cryptography when we want to send a secret information. Plainly visible encrypted messages, no matter how unbreakable they are, arouse interest and may in themselves be incriminating in countries in which encryption is illegal. The advantage of steganography over cryptography alone is that the intended secret message does not attract attention to itself as an object of scrutiny. What is the advantage of steganography over cryptography? Steganography is the practice of concealing a file, message, image, or video within another file, message, image, or video. To provide a functional example, it was implemented a Python class to perform the procedures mentioned in the end of this story.įirst of all, let’s understand what is steganography, digital images, pixels, and color models. ![]() #Python pixel check image overlay how to#In this story, we will learn some image processing concepts and how to hide an image inside another image file. ![]()
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