Dear Gimpers

Please would some kind body here offer to assist me?

I am an artist that painted a large 200cm x 140 cm original oil work.

I then photographed this work and opened the JPEG in Gimp, then manipulated the image using 'Cubism' and 'mosaic' feature.

Then someone saw this image and wants to purchase it, bbut they want the print the same scale as my original artwork...i.e. 200cm x 140 cm

First problem - I cannot recreate the manipulation or see the settings I used for 'cubism' or the 'Mosaic' painted.

Second problem - my canvas printer stated that my resolution is too small to print the canvas that size using this image.

I am desperate to get this done and flabergasted at the fact that the printer's digital graphics expert says this

any one to assist me?

many many thanks

First off i would like to welcome you to Gimp Chat.
When you use a filter in Gimp you have the option to keep filter settings.This setting can be found in Edit>Pref>Tool Options and tick the save tool options on exit.
To set the DPI make sure its 300 dots per inch or more for printing. 72 for web artwork.This can be set when you have the image open by going to Image>Print size, and reset the dpi there.

Hope that helps.

thanks so very much for trying to assist..and thanks for the kind welcome..thank you all for having such a useful and friendly website

Ok so what if I did not set the preferences tool options, is it possible to obtain the settings I used for the Artistic 'Cubism' feature and Distorts 'Whirl and Pinch' and 'Mosaic' settings?

because if I am to enlarge the original file...which I am still not sure is possible, I would need to utilise the original manipulation settings?

thank you

I saw your other post on a mailing list. Same as Rod, your printer gave a 300 dpi resolution for printing. But you have to take into account the large size of the canvas - 2.0 x 1.4 metres.

In round figures this comes out at a canvas size of 24000 x 17000 pixels or as gimp will tell you an image size in memory of 3.5 GB. Even with lots of memory and spooling the image to disk. not practical.

A suggestion was taking several photographs and stitching together with Hugin. Well my 16 Mp camera takes 3000 x 2000 pix images so you would need something like 8 rows x 9 columns. Not easy.
There is an application made specifically for stitching together large 'mosaics' called NIP2 see
http://www.vips.ecs.soton.ac.uk/index.php?title=Nip2
I've used this in the past, again not easy but does not rely on large amounts of system memory

Used filters and forgotten what was used, I have done this, I think most people have. No solution except some trial and error.

thank you so much for your reply...I have no solution yet

I know the solution is not my original image in this case as the manipulation is what the client is buying and I need a gimp expert in South Africa to assist

but thanks thanks thanks for trying to help..its very kind

Obviously the problem was at the root:
save the original as jpg

You should always use png (also xcf if you edit with gimp, anyway png is the best to export with max quality ) and save as BIG you can...also set the dpi always high (i use 900 )

But this to avoid future problem for the present is very hard give a suggestion without see what you have to work with

I may understand well that you don't feel to upload on the web something you are planning to sell, but maybe you may post a fragment :
open your image , crop a part that has some evident problem, SAVE IN PNG, upload somewhere and post the link

In theory is impossible scale up without loosing quality, but luckily in practice what is a degradation may look as a cool effect,

But without see the image or at least a meaningful piece is impossible give more details

As mentioned in the gimp-user list, the original image is very small (2200 x 1398 pixels)(3Mpx)(phone camera?)

....

Bonjour,

With an average resolution of 150dpi you get a picture of 11810 * 8269 pixels.
This resolution gives a decent result when printing.
You can increase the resolution and make tests.

The computation times are long but Gimp treats this image without problem. Here are the tests I made​​:
- Filter "Cubism".
- Save the image under a different name (format xcf.bz2), close this file and open the image.
- Filter "Mosaic".
- Save the image under a different name (format xcf.bz2), etc..
- At the end export to PNG, or any other format.

Tested with Gimp 2.8.0 64-bit Windows.

Test results :
http://www.aljacom.com/~gimp/test_mosai ... saique.jpg
13,4 Mb (14 052 468 bytes)

**********

Hugin is very good for stitch images if your camera's resolution is insufficient