All that most current autotrace features (including the one in Illustrator) do is detect color differences between pixels of a raster image based upon a user-specified sensitivity setting, and then try to draw vector paths which follow along those detected differences. You can use the autotrace feature which exists in Illustrator or any similar program to try to automate the process of "tracing" the raster image with vector paths.Įither way, you end up with what would more accurately be called a "reinterpretation" of the subject, not a "conversion" of the raster image in the sense of "converting" one file format to another.Īnd that's the key. Or (and this is where the all-too-common misconception about "conversion" comes in). You can even import the raster image and use it as a guide while "tracing" it with vector paths. You can re-draw the artwork using the vector drawing tools in Illustrator or any similar program. The artwork represented by a raster image can be redrawn as vector artwork. There is no automagic "conversion" from a raster image to a vector graphic. The result would be more accurate to the original than an autotrace, and the halftone frequency/quality would still be a printing function (or could alternatively be made into lineart in the spot color seps).It must be difficult to convert from illustrator into a vector format since no one has a specific answer. The original image could be processed into spot color channels entirely in Photoshop, and printed as spot-color seps. None of the above dictates a necessity for vector paths for screen printing. All an auto-trace routine does is abide by a color-variance tolerance by which it treats a certain range of adjacent colors as if they are the same, and then tries to draw a path around them. Each pixel has a fixed color value pixels don't graduate. The auto-trace is not going to automatically figure out how to make grad-filled objects out of what merely looks to you like a grad. So in order to recreate the gradient, I would have to redraw the lettering, and physically recreate the gradient in Illustrator? Auto-trace an RGB or CMYK raster image, then run a color-replacement routine to swap out the colors to the nearest matching swatches of a pre-defined set.Auto-trace an RGB or CMYK raster image, then select the resulting objects of a particluar fill color and re-apply a spot color swatch afterwards.Pre-define a set of spot colors for the auto-trace routine to use.What color mode and format is the raster image you are tracing? You're not normally going to automatically get Pantone-specific spot color separations when auto-tracing an RGB or CMYK raster image. ![]() The halftoning of the seps is a printer function. Has no bearing on the necessity of raster vs. Keep the halftones "fine"? As opposed to course? (Keep the halftone frequency high?). You print separations on transparency film from Corel DRAW X4. ![]() We run Corel X4 on our transparency machine We run Corel X4 on our transparency machine, so I need to convert to vector, and keep the halftones fine, as well as keep the pantone color book.Įxplain better. ![]() Screen printing does not necessitate vector-based graphics. Before anyone says "you don't need to use vector for screen printing"
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