In cases like above, we can always use a different method of color separation – like simulated process color separation to use halftones. But there is no need to be afraid that the image looks dotty. You pretty much get what you get and if you don’t like the outcome you have to go back, re-pick colors, and re-separate the job. You cannot apply any “grayscale” adjustments like tone curve to the final separations.
PHOTOSHOP COLOR SEPARATION PANTONE MANUAL
Photoshop can automatically generate a starting point of a sep, but it’s simply not as smart and requires an intervention of a human eye and potentially a manual edit. Another disadvantage is that it takes more time. Especially when there are a lot of transcending colors within a project. That’s why we disadvise using this method of color separation when we work on too many details. Finer mesh size allows to obtain more precise graphics, but the left-alone dots may still be visible. Briefly, the higher the resolution the more detailed the picture can be. 135 – 155 pixels/inch is the standard resolution for most index separation prints. Resolution is just how many rasters, which in our case are the adhering squares, one can fit in an inch-long line. The resolution, in this case, is just the size of the “bits” from the so-called bitmap. It’s hard to transcribe any kind of gradient or shading to a bitmap, without setting a proper resolution. As dots on a bitmap never overlap, it’s commonly used to represent sharp edges often appearing with AM screens too. Therefore it creates a pattern consisting of equal size adjoined square dots of different colors. Bitmapīitmap almost totally keeps you away from the common moiré pattern problem, a waveform pattern caused by interference between half-tone dot angle and screen mesh. Diffusion dither is adding noise perceived as a delicate blur if seen from distance and fixes the problem. For reference, a 12 index color image looks twice as smooth as a 6 index color image. The more colors are used the better an image looks. The key is to make the transition invisible to the human eye. On some separations, it doesn’t even appear, as colors don’t overlap on all projects, and on some, it just requires using more colors. When colors graduate from one to another, they never transient smoothly and therefore, due to lossy compression, transmit to a limited color palette with a visible error. For instance, displaying natural gradients, like sunsets, dawns, or clear blue skies, can show minor visible bands on the computer screen. In some cases, there is a risk of producing abrupt changes between shades of the same color. Without the dithering, the banding effect is visible – a problem of inaccurate color presentation in computer graphics. It makes the colors appear opaque and leaves edges sharp on the outcome. It is easier to color match with index color final prints are bright and high contrast and the index separations also work great and print equally as well on both light and dark shirts! Also, the good news is that you can use Pantone! It’s one of the greatest assets of this separation technique. Index color separation converts an image into a diffusion dither which is a computer-generated stochastic raster displacing the dots closer or further apart from each other to create a pseudo-random square pattern, popularly being referred to as pixels. What distinguishes this method from the simulated process color separation is the use of bitmap instead of halftones. Theoretically, the number of colors is limited just by the number of available printing heads on the machine. The Index Color Separation is the process of breaking down complex designs into few colors, not necessarily Cyan, Magenta, Yellow, and Black. But first things first… What is Index Color Separation However it has its good and bad sides, and it can’t be used for all kinds of graphics.
Using multiple colors allows transferring more complex color patterns on garments making the prints appear more opaque and sharp. Depending on a purpose CMYK is being gradually replaced by index or simulated process color separation, mainly because these methods allow using more than just 4 colors. It’s used as a substitution for CMYK color separation – an inexpensive, but a bit outdated method. The Index Color Separation is one of many kinds of color separations used mainly in screen printing.
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