how to crop image in processing (and export to png file with transparent background)

ATC243750496

thanks in advance!

GoToLoop

Use get() to crop a region:
http://processing.org/reference/get_.html

Then use save() to get it as a file:
http://processing.org/reference/PImage_save_.html

Just make sure to use clear() to have a clean transparent background:
http://processing.org/reference/clear_.html

And an online example which uses get() to obtain a PImage from a PGraphics robot drawing:

http://studio.processingtogether.com/sp/pad/export/ro.9ck0KLYubLcZG/latest

ATC243750496

what about crop i want to do like photoshop but there seems no function to achieve it , and aftere the cut the part cut will be transparent while export to png file in processing

PhiLho

Use mask()

ATC243750496

seems not cut yet? can somebody give me an example??

cameyo

  // save board image (only)
  if (key=='d' || key=='D')
  {
    PImage outIMG, diaIMG;
    outIMG = get(0, 0, width, height);
    outIMG.mask(maskIMG);
    diaIMG = outIMG.get(10, 80, 770, 490);
    diaIMG.save("d" + timestamp() + ".png");
  }

ATC243750496

mask() can only be used with an image that's the same size. the function timestamp() does not exist this two error who can solve it？？？ can somebody told me what mask() is ， in processing language encyclopaedia seemed not concerned with cropping（My English is bad...）

ATC243750496

but how can rotate achieve in back not show （i mean not use image（）in draw（）function drawing it and then rotating finally export）

cameyo

Sorry for my cryptic post. Here is a program to show the use of mask. https://www.dropbox.com/s/1ivryty2cxukikg/hexBoard.zip See the keypress function with 'D' key. Hope this helps.

ciao

ATC243750496

thanks it really helps me

ATC243750496

but what diaIMG = outIMG.get(10, 80, 770, 490); is i saw get but can't find anything similar to image.get() ,does it work similar to get() function ?? hope someone can tell me.

PhiLho

http://bazaar.launchpad.net/~philho/+junk/Processing/view/head:/_QuickExperiments/TexturePaint2/TexturePaint2.pde shows an example of using mask().