access a specific frame from a gif

eduairet

Hi DrawBot experts!!!
Does anyone know how to access a specific frame from a gif?

I'm using the numberOfPages(path) to see them and create the range of a loop but I can't find the way to make the iteration, I was thinking in something like this

path = '~/Desktop/image.gif'
numberOfPages(path) 

for i in range(numberOfPages(path)):
    pass

Thank you!!!

gferreira

hello @eduairet,

you can use the pageNumber argument in image or imageSize to get a given frame in a multipage image (gif or pdf). important: page numbering starts at 1.

see Inserting a PDF

path = '~/Desktop/image.gif'
pageCount = numberOfPages(path)

for pageNumber in range(1, pageCount+1):
    w, h = imageSize(path, pageNumber=pageNumber)
    newPage(w, h)
    image(path, (0, 0), pageNumber=pageNumber)

cheers!

eduairet

@gferreira you rock, thanks a lot!!!!!

traviskochel

Is there a way to do this with an ImageObject()?

I'm trying to do something similar with a pdf, and then apply some filters.

img = ImageObject(path, pageNumber= pageNumber)
img.falseColor(color0=(0,0,1,1))
image(img, (0, 0))

This gives an unexpected keyword argument 'pageNumber'.

And moving the pageNumber to the image call, has no effect. It just inserts the first page:
image(img, (0, 0), pageNumber=pageNumber)

gferreira

hello @traviskochel,

you can use image() inside an ImageObject to get a specific page, and then apply the filters using the image object. like this:

path = 'myFolder/myDocument.pdf'

img = ImageObject()

with img:
    w, h = imageSize(path)
    size(w, h)
    image(path, (0, 0), pageNumber=4)
    
img.falseColor(color0=(1,0,0,1))
image(img, (0, 0))

cheers!

traviskochel

@gferreira Awesome! Thanks so much!

eduairet

This is an old post but this might help someone looking for iteration on gifs, and maybe anyone can tell an interesting fact about it. I've been working with gifs generated via Photoshop and Media Encoder and they crash after the second frame. What has worked for me to fix this problem is to open the gif file with the Mac OS Preview app and rewrite the file, even though this solved my problem it could be great to know if you had a similar experience and how you solved it.