In addition, for details like text, using too much ink can create a muddy appearance, which will affect readability. The reason that “Photoshop Black” isn’t often used in print is that the sheer amount of ink can rip lower quality paper like newsprint. 90) is a much deeper black because it absorbs more light. So-called “Rich Black” or “Photoshop Black” (CMYK: 75. 100) is not the darkest black possible in the color space. “True” BlackĪlthough it might seem counter-intuitive, using 100% black ink in process color (CMYK: 0. This means that some special care will need to be taken when converting files from RGB to CMYK, as some of the colors can appear dulled. It is also important to be aware that the RGB color space contains more colors than the CMYK color space. Some programs (like Adobe Photoshop) will automatically display in RGB color spaces, and so it may be necessary to change the color profile of the image if you are intending on using it in print. Each of these channels is measured from 0% to 100%, and will tell the printer the relative density of each ink that is required. Where RGB color has three channels for red, green, and blue, CMYK color has four channels for cyan, magenta, yellow, and key (black). Unlike RGB color, which is used in screens and digital display technology, CMYK color was created for printed materials. The dots are also printed at angles to each other in order to avoid creating unintentional patterns which could be visible to the user (called Moiré patterns). Image Source: The size and spacing of dots can be altered to produce the overall visible color. This is called ‘half-toning’, and conserves ink while creating the appearance of a solid color provided the dots are small enough. As shown in this example from LCI Paper, different colors of inks are printed onto a surface in dots and then layered in order to produce the desired color.
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