My images are coming through ‘blurred’ when I first call them in; and only
start to clear after maybe 1 or 2 seconds when they get progressively clearer
until reaching the correct resolution. Do I need to download something from
somewhere to enable my images to come straight in at maximum resolution?
It’s not your problem, and there’s nothing you can, or need, to do about
In fact, in classic software parlance: it’s not a bug, it’s a feature!
Let me explain why.
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Jpeg image files (typically files ending in “.jpg” or more rarely “.jpeg”),
can be created to display in two different ways: “Standard” or “Progressive”.
When displayed, a standard jpeg will typically be drawn from the top down, one
line at a time. A progressive jpeg, on the other hand, will display over the
entire image area, but in several passes – each one with more detail than the
It’s that last type of image you’re probably seeing. And as you can probably
see, it’s not something you control – whomever created the image elected to
encode it this way.
The question of course is: why?
The surprising answer: bandwidth.
The question is if you’re downloading an image over a low connection (or
even downloading a large image over a fairly fast connection), how soon will
you realize that the image isn’t worth waiting for?
wants you to see, and how quickly.”
Let’s say the image is downloading and you’ve received 1/4 of the image
data. For a standard jpeg, that means you’ll see roughly the top quarter of the
image. For a progressive jpeg, that means you might see the entire image, but
it’ll be “out of focus”.
For some images that standard format top quarter, in focus, will be enough
for you to know what the rest of the image is going to be. For other images
it’s not. For some images that first progressive format “out of focus” image is
enough. For other images it’s not.
It’s all a matter of how much you want to see, and how quickly. Or rather,
how much the image creator wants you to see, and how quickly.
The good news is that a) the size of the same image encoded either standard
and progressive isn’t all that different, and b) the result when they both
complete downloading is the same.
And with internet download speeds increasing all the time, the actual
difference is rarely important – most images display before you even realize
that they’re one or the other.