It’s usually best, for the purpose of engraving with the laser, to have the graphics in black and white or grayscale before inverting. ![]() Regardless, the graphic’s color values are reversed. In some programs, it’s known as inverting colors in others it’s simply called negative. It’s accomplished in graphics programs by selecting an object and using a tool or function that converts that object to a negative version of the original. Inverting graphics is simply another term for changing a drawing or a graphic component from a positive image to a negative one. I’ve seen enough negative flags and black-headed bald eagles to know that this is an issue. While the white text on glass is, in practice, acceptable, the others are not. And a bald eagle will have a dark head and a white eye on a dark-colored, cotton duck canvas bag. A positive image of an American flag in a drawing engraved on a dark-colored, powder-coated tumbler results in a flag with dark stars on a light field, seven white stripes, and six darker stripes. Text that is black in a drawing will be white on a wineglass. When a graphic is engraved with the laser and makes a mark that is lighter in color than the material being marked, a negative image is created. But if the mark or fill is darker still, the graphic should stay in a positive way.” “If the mark or fill is light, invert the graphic to get it right. Grayscale graphics, photographs, and more complex graphics such as those where relative colors and contrasts need to be preserved should be inverted. I qualify this because many graphics, particularly text, borders, and simple clipart, look just fine either way. If lighter, then inverting the graphic in the drawing may be necessary. Hopefully this article helps.īefore anything is marked with the laser, there is one question to consider: Will the mark that is made, even if color-filled, be darker or lighter than the material being marked? If darker, there is no need to invert the graphic. ![]() But I’ve seen enough examples of completed works, done by skilled craft people, that failed in this regard, so there must be some confusion regarding it. Many may question the need for an article on something so basic. The subject of inverting graphics is easy enough to understand. In order to create a positive image, the graphics in the drawing need to be inverted. What’s black in the drawing translates to stainless steel on the tumbler and a negative image is engraved. Much like writing with chalk on a blackboard, the laser vaporizes the coating and exposes the stainless steel underneath, making a light contrasting mark on the tumbler. It looks like a negative! What just happened? ![]() You clean it up a bit and… it doesn’t look quite right. Using the same graphic, you run a job that vaporizes the color to expose the stainless steel underneath. Then you’re given some black powder-coated tumblers to mark. They all turn out great, with a dark contrasting result. You’ve been marking school logos on stainless-steel tumblers using laser marking material for months.
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