This post is a bridge between
Yesterday’s post on falling snow
And actually making an animated image like this tomorrow
Geese in a snowstorm
200 yards from my front door
It really was snowing that day
Made with my 1st camera – a 2 MP point & shoot
Literally a grab shot; I came into sight & away they flew
Just a second to react – lucky
Part 2 – Another “pre-requisite post”
Before tackling animated snowfall
Tomorrow we’ll make the snow fall – really
This post looks at some of the variables that must be decided when
Creating images for use in an animated GIF
How many should be in the set?
The number in the set is image dependent
In the above, six images were adequate due to the simplicity of the subject
For the ball in a box, eight were exactly enough
Any fewer would ruin the effect
More, although unnecessary,
would make the animation smoother
There is no “right” number for a snow scene like the above
Factors like animation duration and
Animation smoothness come into play (more below)
This example uses 15 images
Each is shown for 0.2 sec for a total of 3 sec.
The 3 sec. is smooth, but there’s a jump at the end
Clearly this is important.
The correct order is usually obvious.
If it’s wrong, that’s obvious, too
Above, the order of the 8 balls shown above was randomized
And, next, the original order was reversed
If the snow fall image order is reversed,
We get snow “rise”
How long should each image be on the screen?
That depends on the effect you want –
Illusion of motion – fractions of a second
0.3 snow above; 0.2 boxed ball
Seconds instead of fractions if you want a slide show look
Animation – The Illusion of motion (smooth or jerky?)
An animated GIF image (this is what we’re making) has a finite duration
It repeats over & over
Generally, we’d prefer to have nice smooth motion
With animated GIF that’s often easier said than done
Motion will be jerky if –
Images are poorly made
Number of images is too small
Time for each image is too large
There is discontinuity in the “jump” back to the 1st image after the end
The first two ball animations were fine
The final image matches the 1st image
The falling snow – not so fine
The 1st & last images don’t match
As a result there’s a “jump” at the end
Tomorrow’s post will look at this issue
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