https://bugzilla.wikimedia.org/show_bug.cgi?id=71553

Tisza GergÅ‘ <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Overlay blurry placeholder  |Overlay thumbnail
                   |with actual image           |placeholder with actual
                   |                            |image

--- Comment #1 from Tisza GergÅ‘ <[email protected]> ---
Duh, misclick.

MediaViewer displays a placeholder image (the small-resolution thumbnail of the
same image, enlarged and blurred) while the real image is loading. To make the
improve the usefulness of the placeholder and give a stronger sense of
progress, the real image should be positioned on top of the placeholder
(instead of the current mechanics of replacing it when the loading has
finished).

For non-progressive images, the image is rendered gradually from top to bottom
by most browsers, so this would result in the placeholder gradually becoming
sharp from top to bottom. Romanski made a simple demo:
http://jsfiddle.net/Czwpu/1/

For progressive images, the placeholder would not be visible at all (or just
for a very short time, until the lowest resolution is loaded). Example of
progressive loading: http://pooyak.com/p/progjpeg/

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