What's going on with 'Export As'

[Microphonic]

Please see the screenshot....any ideas??? Have I done something obvious? (probably knowing me...)

[JJMack]

What have you done what is the problem.  I see your  1440x900 screen capture Part of you export as window is off screen what can you tell us about  you screen capture.

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[Microphonic]

Sorry I suppose it may not be obvious on all monitors / under all viewing conditions.

The export preview is massively more contrasty than the original, this also applies to the exported file. It only affects this file.

Thanks

[Microphonic]

It looks like the contrast has been maxed out somehow, but as you can see from the artboard this is not the case - the contrast is much much less

[JJMack]

Well your interpolating the image down to 22% size, converting color spaces. striping meta-data and saving a jpeg file.  You could do the same with export Save for web that been around for a long time.  See if it produces the same results.  Export as is relatively new and may have bugs that need to be worked on.

[JJMack]

In both views your look at scaled down images not either image's actual pixels. View at 100% to see both image actual pixels in both views.

[JJMack]

What I see ate 100%