(01-02-2019, 07:18 PM)rich2005 Wrote: In most commercial printing White = Transparency. Offset (& Inkjet) printing uses cyan, magenta, yellow, black inks mixed to create the colors. Anything White is not printed and takes the colour of the printed-on material.
You should also check the printing resolution of your image. 96 pixels-per-inch (ppi). Very low for quality printing. 200 to 300 ppi is more usual.
The usual advice. Speak to the printing company about your requirements.
I'm uploading my work to Redbubble, and apart from saying:
"the best resolution A good rule of thumb is that big, high-resolution files make the best prints. Now when we say ‘big’, we're really referring to resolution, not the file’s size."
and
"If you'd like to use a single image file for every product, we'd recommend starting with 7632x6480 pixels"
"please also so note that DPI and PPI don’t have any effect on your final uploaded image."
They don't say much.
https://help.redbubble.com/hc/en-us/arti...0679#color
They do mention that they print in CMYK and that is best to work in that format, but I couldn't get one of the plugins that does that to work in Gimp. I'm sure I'll try again in upcoming weeks when I have less work.
Also, I'm using the maximum resolution Gimp supports, which is "1048576.000" pixels/inch, and using >precision> 32 bit floating point, and exporting in NoHalo which i read that's best for up sizing images. I also read several times, that for printing, minimum for small formats is 30.000 pixels/inch. I've being meaning to get more info on that subject, but I have a rather large list of subjects which I'm going through.
I'm guessing Redbubble uses industrial professional printers for all their products. I've been educating myself on how professional printers and all that system works. But again, I'm doing 10 things at a time.
Summarizing, Redbubble gives very little information on how to work with their platform in terms of dimensions and formats, but it's very easy to use, and they have tons of products in which you can print on. I started only 2 months ago to work with that platform and to inform myself on how to deliver the best products I can.
(01-02-2019, 07:28 PM)Blighty Wrote: A bitmap image is always rectangular. So you cannot just add an alpha outline. Adding the 8 pixels to the width and height is the correct method.
Thanks Blighty, I'll apply that method from now on when I need an alpha outline in one of my stickers, like the one I'm working on today.