feature: Picture.replace_image()

As discussed on the mailing group (https://groups.google.com/forum/?hl=en#!topic/python-pptx/YJBzJznTTHw), there are some potential uses for replacing an image with a new one. [Think “refreshing” a PPT with updated images.]

Some working code (largely suggested by Steve) is as follows:

from pptx import Presentation
from pptx.util import Px
from PIL import Image

# inputs
PPT_TEMPLATE = 'test.pptx'
REPLACEMENT_IMG = 'pic.png'

# load preso and shape
presso = Presentation(PPT_TEMPLATE)
slide = presso.slides[0]
img = slide.shapes[0]

# get current image info
imgPic = img._pic
imgRID = imgPic.xpath('./p:blipFill/a:blip/@r:embed', namespaces=imgPic.nsmap)[0]
imgPart = slide.related_parts[imgRID]

# get info about replacement image
with open(REPLACEMENT_IMG, 'rb') as f:
    rImgBlob = f.read()
rImgWidth, rImgHeight = Image.open(REPLACEMENT_IMG).size
rImgWidth, rImgHeight = Px(rImgWidth), Px(rImgHeight) # change from Px

# replace
imgPart._blob = rImgBlob

# now alter the size and position to suit that of the replacement img
# rescale sizes so image isn't stretched
widthScale = float(rImgWidth) / img.width
heightScale = float(rImgHeight) / img.height
maxScale = max(widthScale, heightScale)
scaledImgWidth, scaledImgHeight = int(rImgWidth / maxScale), int(rImgHeight / maxScale)
# center the image if it's different size to the original
scaledImgLeft = int(img.left + (img.width - scaledImgWidth)/2)
scaledImgTop = int(img.top + (img.height - scaledImgHeight)/2)
# now update
img.left, img.top, img.width, img.height = scaledImgLeft, scaledImgTop, scaledImgWidth, scaledImgHeight

[timini]

+1 would like this feature

[lokesh1729]

to those who wants a solution, summing up from above comments

there are two solutions

Solution 1

new_shape = slide_obj.shapes.add_picture(
    img_location,
    Inches(shape_left),
    Inches(shape_top),
    Inches(shape_width),
    Inches(shape_height),
)
old_pic = shape_obj._element
new_pic = new_shape._element
old_pic.addnext(new_pic)
old_pic.getparent().remove(old_pic)

slide_obj -> is the slide where you want to add picture

img_location -> path to the image file

shape_obj -> existing picture shape object

shape_left, shape_top, shape_width, shape_height -> are self explanatory

Solution 2:

def _replace_picture(self, slide_obj, shape_obj, img_location):
    # noinspection PyProtectedMember
    with open(img_location, "rb") as file_obj:
        r_img_blob = file_obj.read()
    img_pic = shape_obj._pic
    img_rid = img_pic.xpath("./p:blipFill/a:blip/@r:embed")[0]
    img_part = slide_obj.part.related_parts[img_rid]
    img_part._blob = r_img_blob

in this method we’re replacing blob, there’ll be a problem with this method when you have a requirement to replicate current slide in a loop.

For example, let’s say you want to replicate a slide containing image for 5 times. Each time you want to put 5 different images namely a, b, c, d, e

So, what’ll happen with this method is you’ll see the last image i.e. ‘e’ in all 5 slides. why ? because we’re replacing blob so the latest blob will be put everywhere