For a raster engrave the glowforge will scan each line from side to side. It does try to optimize and only go as far as it needs to in order to cover the etched areas. So a circle, for example will be shorter/quicker at the top and bottom than in the center. However, if your raster includes a box around it (ie not a separate score operation), it will scan every line completely. So the time taken will be independent of the content. It’ll just be number of lines * the time it takes to go from one side to the other and move to the new line.
The quickest way to speed this up is to reduce the engraved LPI using manual settings. It will also speed things up to score the border rather than include it in the raster, but not as much as reducing the LPI.
The purple square shows that the entire thing will be engraved, not just the words. I’m not sure what the file type is for the text, but if it’s a PNG you should save with a transparent background to remove the white. That’s the easiest way to solve it.
I get that it treats the white as transparent and doesn’t actually mark the surface of the material, but when I process two versions of the same image (white background vs transparent background) there is a significant difference in engraving time. I just did a quick test to confirm and the solid white image took 11 minutes to do, the transparent version only 6 minutes. Am I the only one experiencing this?
If you have a 10" x 10" white-filled box with a 1" x 1" box to engrave in the middle, I believe if you turn the white to transparent, you end up with just a 1" x 1" box to engrave (and no 10" x 10" transparency).
I didn’t need to do so to prove it to myself. I mentioned this not long ago - as I was pleasantly surprised that the software was intelligent enough to ignore it/255,255,255 and create a shorter motion plan.
If you aren’t using a swatch or setting it to 255, 255, 255 it can be a little more difficult to get white. You only have to miss pure white by a hair and then you end up with a tint, shade or tone (yup, all different things).