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    This is the community forum for my apps Pythonista and Editorial.

    For individual support questions, you can also send an email. If you have a very short question or just want to say hello β€” I'm @olemoritz on Twitter.


    Pythonista crashes trying to save merged photo

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    • ccc
      ccc last edited by

      Is there a way to del photo when you are done with them. Pythonista has been known to crash when you load photo after photo without del-ing previous ones.

      1 Reply Last reply Reply Quote 0
      • cvp
        cvp @jm2466 last edited by cvp

        @jm2466 the problem comes (I guess) from 'too much memory' in appex mode.
        Try this script in normal mode and see also how we have to save a new photo now (no more photos.save_image, at least in the help of the beta)
        Obviously, like @ccc adviced, you could delete each image as soon it has been pasted.

        import appex
        import console
        from PIL import Image
        from PIL.ExifTags import TAGS
        import photos
        import os
        import ui
        
        # standard get exif code - needed for image size
        def get_exif(fn):
            ret = {}
            i = Image.open(fn)
            info = i._getexif()
            for tag, value in info.items():
                decoded = TAGS.get(tag, tag)
                ret[decoded] = value
            return ret
        
        class MyView(ui.View):
          def __init__(self):
            self.frame = (0,0,500,500)
            if not appex.is_running_extension():
                assets = photos.get_assets()
                assets = photos.pick_asset(assets=assets,multi=True)
                images = []
                for asset in assets:
                    images.append(asset.get_image())
            else:
                images = appex.get_images(image_type='pil')
            print(f'len(images) = {len(images)})')
            #console.hud_alert(str(len(images)))
            
            # get the widths/heights of the images
            widths, heights = zip(*(i.size for i in images))
        
            # this is stacking vertically so the width is the max width of all the pics
            max_width = max(widths)
            # since stacking vertically the height is the total heights of the pics
            total_height = sum(heights)
            print(f'total height = {total_height}')
            #console.hud_alert(str(total_height))
            print(f'max width = {max_width}')
            #console.hud_alert(str(max_width))
            
            # create a new blank image in the required size
            console.hud_alert(str(4*max_width*total_height))
            #return
            new_im = Image.new('RGBA', (max_width, total_height))
            print(f'new_im.size = {new_im.size}')
            console.hud_alert(str(new_im.size))
        
            # now assemble the merged pic
            
            # y_offset controls the pixel location of where each image is added
            # to the new image - to add each end-to-end
            # starting at the top which is y = 0
            y_offset = 0
            # loop through all passed images
            for im in images:
                # paste in the image at the left edge (x=0) and current offset for y
                new_im.paste(im, (0,y_offset))
                print(f'y_offset = {y_offset}')
                console.hud_alert(str(y_offset))
                # increase the offset by the height of current pic
                y_offset += im.size[1]
        
            # save the new image to the camera roll
            new_im.show()
            #photos.save_image(new_im)
            path = 'temp.jpg'
            new_im.save(path , quality=95)
            photos.create_image_asset(path)
            os.remove(path)
        
        def main():
          v = MyView()
          v.present('sheet')
        
        if __name__ == '__main__':
            main()
        
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        • cvp
          cvp @JonB last edited by cvp

          @JonB unfortunately there is no log generated 😒 , like often for crash due to memory problems

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          • jm2466
            jm2466 last edited by

            Sorry for the delay in replying and thanks for the help.

            So from the above suggestions it appears deleting the photos once merged may be the best solution but I am not quite sure how to do that correctly. This is an extension so will receive the selected photos that I believe are just references/names of the photos and not the actual image - is that correct? My code then loops through the list and actually gets the photos and adds to a list. First it sounds like I should not get all of them before processing but rather merge each one as it is retrieved. Once that is done I need to β€œdelete” it in the program, or really just delete/remove it from program memory what is the best way to do this without deleting the actual photo?

            Thanks

            1 Reply Last reply Reply Quote 0
            • ccc
              ccc last edited by

              for asset in assets:
                  image = asset.get_image()
                  images.append(image)
                  del image
              
              1 Reply Last reply Reply Quote 0
              • jm2466
                jm2466 last edited by

                Thanks!!

                1 Reply Last reply Reply Quote 0
                • jm2466
                  jm2466 last edited by

                  I added the del image after it is pasted into the merged image and that part appears to work. The program is now having a problem saving the merged image to the camera roll. If I instead save it to the Pythonista file system it works and is a workaround until the camera roll save is figured out. Any other thoughts on how to fix the camera roll save is greatly appreciated.

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                  • ccc
                    ccc last edited by

                    Do you have a GitHub repo? It is more difficult to debug English prose that it is to debug Python code.

                    1 Reply Last reply Reply Quote 0
                    • jm2466
                      jm2466 last edited by

                      Unfortunately I do not.

                      But if you look at the code in my original post I added one line in the for loop to delete the image (below is the loop from that post with the del at the end)

                          for im in images:
                              # paste in the image at the left edge (x=0) and current offset for y
                              new_im.paste(im, (0,y_offset))
                              print(f'y_offset = {y_offset}')
                              # increase the offset by the height of current pic
                              y_offset += im.size[1]
                              del im 
                      

                      As mentioned that seemed to fix the issue pasting more than a few images into the new one.

                      This line crashes Pythonista:

                          photos.save_image(new_im)
                      

                      But I can save it to the Pythonista file system with the following:

                          new_im.save('combined.jpg')
                      
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                      • ccc
                        ccc last edited by

                        This is long shot but:

                        del new_img
                        photos.save(Image.open('combined.jpg'))
                        
                        1 Reply Last reply Reply Quote 0
                        • jm2466
                          jm2466 last edited by

                          Thanks. I tried that but it crashes trying to save the image to the camera roll. I can open the jpg in Pythonista and manually add it to the camera roll. Here are the lines at the end that I added:

                          	new_im.save('combined.jpg')
                          	del new_im
                          	photos.save_image(Image.open('combined.jpg'))
                          
                          
                          cvp 1 Reply Last reply Reply Quote 0
                          • cvp
                            cvp @jm2466 last edited by cvp

                            @jm2466 I'm in holiday, thus perhaps not able to correctly understand all (🍷🍷) but why did you not use

                            photos.create_image_asset(path)
                            

                            instead of

                            photos.save_image(Image.open(path))
                            
                            1 Reply Last reply Reply Quote 0
                            • jm2466
                              jm2466 last edited by jm2466

                              Um... because you never told me to until now??? :) kidding of course. But honestly have no real answer to that question. Possibly because I wanted to save an in-memory image and not have to save the file locally first (at least that was the initial plan but is not where I am at with it now). Not sure if create image asset supports that (I tried passing the variable and got an error that a str is required).

                              I just tried your suggestion and it works - I mean it saves the locally saved combined.jpg to the camera roll. Thanks!!!

                              Any thoughts on how to get this to work without saving combined.jpg first???

                              cvp 2 Replies Last reply Reply Quote 0
                              • cvp
                                cvp @jm2466 last edited by

                                @jm2466 You could always convert your PIL Image into an ui.Image and use this kind of code to save it in camera roll

                                # only to have an ui.Image
                                import ui
                                img = ui.Image.named('test:Bridge')
                                
                                # Create a PHAsset from an ui.Image (not from a PIL Image)
                                from objc_util import *
                                import threading
                                
                                NSBundle.bundleWithPath_('/System/Library/Frameworks/Photos.framework').load()
                                PHPhotoLibrary = ObjCClass('PHPhotoLibrary')
                                PHAssetChangeRequest = ObjCClass('PHAssetChangeRequest')
                                
                                lib = PHPhotoLibrary.sharedPhotoLibrary()
                                def change_block():
                                    req = PHAssetChangeRequest.creationRequestForAssetFromImage_(img)
                                def perform_changes():
                                    lib.performChangesAndWait_error_(change_block, None)
                                
                                t = threading.Thread(target=perform_changes)
                                t.start()
                                t.join()
                                
                                1 Reply Last reply Reply Quote 1
                                • cvp
                                  cvp @jm2466 last edited by cvp

                                  @jm2466 this

                                      # 1) convert PIL Image to ui.Image
                                      console.hud_alert('convert PIL Image into ui.Image')
                                      with io.BytesIO() as bIO:
                                          new_im.save(bIO, 'PNG')
                                          ui_image = ui.Image.from_data(bIO.getvalue())
                                      del bIO
                                      # 2) Create a PHAsset from an ui.Image (not from a PIL Image)
                                      console.hud_alert('Create a PHAsset from an ui.Image')
                                      lib = PHPhotoLibrary.sharedPhotoLibrary()
                                      def change_block():
                                          req = PHAssetChangeRequest.creationRequestForAssetFromImage_(ui_image)
                                      def perform_changes():
                                          lib.performChangesAndWait_error_(change_block, None)
                                      t = threading.Thread(target=perform_changes)
                                      t.start()
                                      t.join()
                                  

                                  is about (πŸ˜€) 1000 x slower than

                                      path = 'temp.jpg'
                                      new_im.save(path , quality=95)
                                      photos.create_image_asset(path)
                                      os.remove(path)
                                  
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