Image open resources saving best practice

[g_costanza]

Hi all,
I'm working on a python script where I need to load something like 50-100 png images 30x50px big.
I need to load them based on some conditions determined by user choice.

I'm wondering what's the best practice to save resources:
1. load the single pngs when needed
2. load all of the pngs at the begining
3. make a big png containing all the imgs and dividing them with "blit" as they do in here http://wiki.forum.nokia.com/index.ph..._using_sprites

Thanks

Giuseppe

[sogniator]

1. load the single pngs when needed
2. load all of the pngs at the begining
3. make a big png containing all the imgs and dividing them with "blit" as they do in here http://wiki.forum.nokia.com/index.ph..._using_sprites

for img in img's path
    image.append(graphics.Image.open(img))

import graphics
container = graphics.Image.new(desired_size)
container.blit(png,coord)

do u mean this

[g_costanza]

Yes,
Is this the most efficient method?

thanks

Giuseppe

[sogniator]

def png_loader(args):
   if type(args) == list:
       img.append([i for i in args])
       return img
   else:
       return graphics.Image.open(args)

[aya42]

3. make a big png containing all the imgs and dividing them with "blit"...

This is probably quickest. If you want to save more time, you could 'blit' them on-demand.

[JOM]

I need to load something like 50-100 png images 30x50px big.
I need to load them based on some conditions determined by user choice.

I'm wondering what's the best practice to save resources:
1. load the single pngs when needed
2. load all of the pngs at the begining
3. make a big png containing all the imgs and dividing them with "blit"

Create one big file beforehands, load it at the beginning of your app and then do blit as needed. Opening and reading a file can be slow, you don't want to make your app look slow all the time. Slow startup is acceptable, especially if you have some wait dialog or splash screen at start.

Cheers,

--jouni

[g_costanza]

Thanks jouni your answer sounds reasonable

and thanks sogniator for the snippets.

Giuseppe