Crop & resize image to measurements. - Printable Version +- Gimp-Forum.net (https://www.gimp-forum.net) +-- Forum: GIMP (https://www.gimp-forum.net/Forum-GIMP) +--- Forum: General questions (https://www.gimp-forum.net/Forum-General-questions) +--- Thread: Crop & resize image to measurements. (/Thread-Crop-resize-image-to-measurements) Pages:
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RE: Crop & resize image to measurements. - idiocracy - 03-23-2023 (03-22-2023, 05:49 PM)rich2005 Wrote: That should print OK, You might want to consider a little sharpen / or not A default unsharp mask for example. That is correct, there's a 3mm margin. They replied that they print at 150 dpi. Now i don't know if ppi and dpi are basically the same, or wildly different. But i've set ppi to 300 for each exported image. So it should be fine? I just open the sharpening, click ok and then it's applied? RE: Crop & resize image to measurements. - rich2005 - 03-23-2023 [attachment=9584 Wrote:idiocracy pid='33811' dateline='1679558547']That is correct, there's a 3mm margin. They replied that they print at 150 dpi. Now i don't know if ppi and dpi are basically the same, or wildly different. But i've set ppi to 300 for each exported image. So it should be fine? That is interesting. First the ppi / dpi In this case they are interchangeable. A guide to ppi https://resources.printhandbook.com/pages/dpi-for-printing.php but save that for later. Question. Does the 110mm x 90 mm include the 3 mm margin ? Is the initial crop in a 113:93 ratio or is your 110:90 correct ? If the Printer uses 150 ppi then you should use 150 ppi and set that in the Image -> Print Size resolution. That ends up with an image size of 667 x 549 pixels for a printing size of 113mm x 93mm. Not photo quality but probably applicable to type of printing material. A plain card or an absorbent art paper is never photo quality. To sharpen or not to sharpen is all a matter of preference. Going by the above probably no. This is a 113mm 93mm @ 150 ppi crop and scale. The scale shows at 34% , which is about a low as I would like to go. Open it up in Gimp, check the Image -> Print Size for 150 ppi RE: Crop & resize image to measurements. - idiocracy - 03-23-2023 (03-23-2023, 08:42 AM)rich2005 Wrote:(03-23-2023, 08:02 AM)idiocracy Wrote: That is correct, there's a 3mm margin. They replied that they print at 150 dpi. Now i don't know if ppi and dpi are basically the same, or wildly different. But i've set ppi to 300 for each exported image. So it should be fine? Yes, the 110x90mm includes the margin, they told me to just send them 110x90mm images and they'd do the rest. Basically they just scale the image further down by 3mm. The final product is 110x90mm. If i open up an already exported image and change the ppi, would that be fine or should that have been done before exporting? RE: Crop & resize image to measurements. - rich2005 - 03-23-2023 If you change the ppi 300 -> 150 then the printing size doubles and becomes 220mm x 180mm Very probably the Printer will scale the images down for you. (but you never know with Printers, some a helpful, some not-so) Since the Printer does not mention pixel sizes, try using as you already have. RE: Crop & resize image to measurements. - idiocracy - 03-24-2023 (03-23-2023, 08:58 AM)rich2005 Wrote: If you change the ppi 300 -> 150 then the printing size doubles and becomes 220mm x 180mm If i set ppi to 150, i have to scale the image from width 3840 down to about width 1000. I've already sent them a few images and they appear to scale them to size, so the once with ppi 300, they did not complain about. RE: Crop & resize image to measurements. - rich2005 - 03-24-2023 (03-24-2023, 09:28 AM)idiocracy Wrote: If i set ppi to 150, i have to scale the image from width 3840 down to about width 1000. I've already sent them a few images and they appear to scale them to size, so the once with ppi 300, they did not complain about. From your previous posts, the Printer just wants a 110mm x 90mm printing size. You send those 110mm x 90mm @ 300 ppi (1300 x 1063 pixels) which is photo quality. If they need to fit that to 150 ppi for printing on card, just let them. RE: Crop & resize image to measurements. - rich2005 - 03-24-2023 (03-24-2023, 09:49 AM)nishantkumare617 Wrote: I'm using real world size because when printed out, they have to fit within certain measurements. That is ok, Just send them off to the Printer. Going right back to the beginning Gimp works in pixels not millimetres and the size of your image in pixels depends on the the printing resolution. 110 mm x 90 mm @ 72 ppi = 312 x 255 pixels = poor quality 110 mm x 90 mm @ 300 ppi = 1300 x 1063 pixels = good quality ... but ... looks like the Printer will take anything you send them and print it at the required size. Use your 300 ppi cropped images. RE: Crop & resize image to measurements. - idiocracy - 03-24-2023 (03-24-2023, 09:35 AM)rich2005 Wrote:(03-24-2023, 09:28 AM)idiocracy Wrote: If i set ppi to 150, i have to scale the image from width 3840 down to about width 1000. I've already sent them a few images and they appear to scale them to size, so the once with ppi 300, they did not complain about. I'll do that. Thanks. |