Re: [applekeynote] Re: Large graphics files

I have had great interest in file sizes over the years, as we have visited the image size topic  from time to time. Brian and Les are right on the money. You do not need 300 dpi, but then - should you wish to shrink files - you need to maintain multiple file sizes of the original image creating a filing issue in iPhoto, or whatever you use.  By contrast, projector incompatibilities have probably caused me more grief over the years than anything else.

A few years ago I pretty much quit shrinking jpeg files, or size the originals to 1024 x 768 at 300 dpi, ensuring availability  of a decent quality original image (Exception: huge Tiffs > 5-10 MB).

I  routinely present 250 - 350 MB (or larger) files from a 2003 old G4 w 1 Gig, and from a two year old MacBook Intel w 1 Gig, and have seen slide transition delays delays perhaps once in a five year period of intensive presenting. The exception seems to be the use of some of the new smart builds: I DO see delays when using something such  as the "spinning caroussel thing" loaded with ten or twelve larger images, This implies that there is a limit to the number of MB's on a single slide - in part likely controlled by processor speed, available RAM etc.  Until I started using some of these smart builds occasionally, I was under the impression that Keynote could handle almost anything on a single slide because I understood that it only retains two slides in memory: the one on the screen, and the next slide. Yet, when embedding a videoclip (some can be huge) there is no appreciable delay - so that has to trigger a hyperlink, rather than load the entire file as part of the slide transition. When Keynote has to reconfigure/resize any image (esp. video), you will lose some resolution.

On Jan 30, 2009, at 6:24 AM, Tim Thoelecke Jr. wrote:

Agreed. My presentations are nearly all photos. I've had pretty good luck letting KN do it, but you have more control if you do it outside KN. Also, if  the images are TIF files, they are still pretty big when imported and can bloat the presentation. 

One other thing to note is that you are at the mercy of the projector most of the time. I have my own, but most of the time I'm using whatever is provided. Sometimes they look horrible. 

Good luck. 

On Jan 29, 2009, at 9:03 PM, davidr_222 wrote:

A number of the files are in the 1 to 2 megabyte range. I want to fill
about half the screen with each image. I would imagine that lower
resolution images would produce less striking images on the screen. 
Have people had experience with this one way or the other?

--- In applekeynote@yahoogroups.com, Juan M <juanm@...> wrote:
>
> how large is large?
> 
> 
> and why not reduce the resolution?
> 
> This is not print media you don't need 300dpi at 1920 x 1080 for a 
> great quality presentation.
> 
> 
> 
> On Jan 29, 2009, at 9:48 PM, davidr_222 wrote:
> 
> > I'm working on a presentation will have quite a few large images.
> > This causes pauses during the presentation while the images load. Is
> > there a way to pre-load the images at the start of the presentation or
> > any other solution other than creating smaller lower resolution files?
> >
> >
> >
>

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