Finally, by entering 128 in the offset box, you brightened the. Entering 2 in the scale box told Photoshop to halve the effect. Then you told Photoshop to blend the layers by subtracting one from the other.
But hey- when your in a pinch it can work so you can get the job done. By selecting the Shadows & Color layer, you told Photoshop to blend the high and low-frequency layers together. This is a very simple and "crude" way to create your film positives for screen printing. One way is to separate each color to it's own layer in Photoshop and print your film positives. Spot color separation in Photoshop can be done a couple different ways. Halftones are another factor to take into consideration- a 35lpi can give your print a completely different look then a 55lpi print will. Your halftones can range from 35lpi to 65 lpi. I recommend using a RIP (raster image processor) to print halftones. In the pop up print dialog box select separations instead of letting the printer or Photoshop manage colors. When you have all the colors separated your ready to print out of Photoshop.
Learn how to do a basic spot color separation inside Photoshop for outputting film positives for screen printing t-shirts.Ĭolor Separations in Photoshop - Channel Separations