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resizing in GIMP 2.10.14
#1
Hi there folks,

I am terrible with computers and its driving me off the wall. I just downloaded GIMP 2.10.14 mostly just to re-size my drawings that i get printed to sell them. This is my first time using GIMP or any proper photo software for that matter.

My artwork is all scanned at 600dpi and they are mostly A4 images. I need to change their sizes to A5, A6 and A3. So i go into Image>Scale, look up measurements of A3 in inches and change them. It always says my image would be more than 650MB, why is that? Maybe I need to lower the dpi? But i dont want to lower it too much incase i lose the quality of the print. Because selling my art-work, its quite important for me to have a crisp print of my work. Also another thing i notice is when i look into dimensions of my scanned A4 image, it shows at 51.344 inches height and 71.042 inches width. That cant be right?

One of the ways, I think i have got around it after speaking to someone is to open a new document, set its measurements to A3 or the size i want and then upload the image into it. 

Now I thought i might look into a way if i can change the image size of a batch which would save me going through every image. I downloaded Batch Image Manipulation Plugin, but it doesnt seem to allow me to change dimensions in inchs, mm, cm etc. It only seem to show me the option of resizing in %. 

Is there a way to change resize load of images to A3, A4, A5 measurements in a batch?

Thanks a million
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#2
Bitmap images have sizes in pixels, not inches. Much easier once you learn to think in pixels.

See this thread:
https://www.gimp-forum.net/Thread-How-to...entimeters
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#3
(12-12-2019, 10:15 PM)haq81 Wrote: It only seem to show me the option of resizing in %.

A5 is 50% of A4
A6 is 50% of A5 or 25% of A4
etc.

https://de.wikipedia.org/wiki/Datei:A_si...ration.svg
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#4
Information about enlarging images without minimum lost of quality :

https://www.youtube.com/watch?v=Qk3BP8vzPdY
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#5
My thoughts

Quote:My artwork is all scanned at 600dpi and they are mostly A4 images

Exactly A4 ? Opened in Gimp they should be 4960 x 7016 pixels - Look top of the Gimp Window for image size. Some scanners will do an automatic crop-to-size.

Quote:So i go into Image>Scale, look up measurements of A3 in inches and change them. It always says my image would be more than 650MB

These are big images, uncompressed size in Gimp. As a compressed jpeg it might only be a MB or two

Quote:if i can change the image size of a batch which would save me going through every image. I downloaded Batch Image Manipulation Plugin

Do not use BIMP, there is an 'other Gimp procedure' for scaling in pixels but it crashes BIMP. Tried in both BIMP 1.8 and 2.2 (a bit flakey) both the same.

For something with a GUI try XnViewMP Various versions here: https://newsgroup.xnview.com/viewtopic.php?f=82&t=39653

It does a batch convert but unlikely that you will get everything in one go. Page sizes, Landscape or portrait, all need different set-ups.

This an example for a rectangular image to A5 portrait with borders. https://i.imgur.com/2dVYMfw.jpg my pixel chart inset

....and as a final shot.. 600 ppi is well over the top. 300 ppi more than adequate.
Print a large image using a professional colour laser and it might use 254 ppi (100 pix-per-cm) but with interpolation gets outstanding results. example: https://www.digitalab.co.uk/about-lightjet-prints/
Then there is actual display use. See: http://resources.printhandbook.com/pages...inting.php
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#6
Converseen - I use this app if there is a large batch ( 50 to over 1000++ ) of photos to change 12 x 9 jpg into 16 x 9 png
It can change size, format, replace transparent background, scale,flip, rotate, and do scroll to bottom left corner for the output options inc renaming
Best done with a duplicate copy of the batch of images -
only limit is the power, ram and swap of the hardware.
TAKE special care of the settings feature - check all the areas of the apps page, not all are on the left column.
Best done with a duplicate copy of the batch of images -
Better safe (with copied folder of images) than having ruined the originals because you (read that me (I know I have done this)) missed a setting and destroyed the batch.
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#7
thank you so much guys, what an amazing community of helpful people. so humbling Smile
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