Reply to thread

Message

<blockquote data-quote="WayneF" data-source="post: 297222" data-attributes="member: 12496">I cannot show a screen view of this effect.... I suppose a movie camera could capture it, but a screen capture only captures the Levels tool.&nbsp; A screen capture movie tool probably gets it OK.On the top image (which is less seriously clipped)...&nbsp;&nbsp; Hold down ALT or OPTION key and while holding, then slightly touch the Levels White Point slider (you do have to move it, but only the slightest amount), and the preview image goes all black, except ONLY the bright lower red leaf is shown.&nbsp;&nbsp; The full lower bright leaf, and several more pixels higher above it.&nbsp;&nbsp; That is saying those pixels are being clipped at the, say 254 position of the slider, which says those pixels you can see are brighter than the 254 (or whatever value).&nbsp; Which if 254, those pixels are clipped (perhaps just one channel, red here).Yes, I just Copied and Pasted (clipboad) your two images to my editor, and used the levels tool there.Also try it on an image that is NOT CLIPPED, and you will see you have to slide the slider very much lower, much less than 254 probably, to see any pixels other than black.&nbsp;&nbsp; This threshold (of seeing them appear in the black) is then telling you the pixel value of those pixels that appear then.&nbsp; The regular color Eyedropper can also tell you this.&nbsp; That bright lower leaf is about color (255, 0, 74), which is clipped in the red channel.&nbsp; But this Levels tool is real handy when critically adjusting exposure or white point.&nbsp; You can see what you are actually doing.</blockquote>

[QUOTE="WayneF, post: 297222, member: 12496"] I cannot show a screen view of this effect.... I suppose a movie camera could capture it, but a screen capture only captures the Levels tool. A screen capture movie tool probably gets it OK. On the top image (which is less seriously clipped)... Hold down ALT or OPTION key and while holding, then slightly touch the Levels White Point slider (you do have to move it, but only the slightest amount), and the preview image goes all black, except ONLY the bright lower red leaf is shown. The full lower bright leaf, and several more pixels higher above it. That is saying those pixels are being clipped at the, say 254 position of the slider, which says those pixels you can see are brighter than the 254 (or whatever value). Which if 254, those pixels are clipped (perhaps just one channel, red here). Yes, I just Copied and Pasted (clipboad) your two images to my editor, and used the levels tool there. Also try it on an image that is NOT CLIPPED, and you will see you have to slide the slider very much lower, much less than 254 probably, to see any pixels other than black. This threshold (of seeing them appear in the black) is then telling you the pixel value of those pixels that appear then. The regular color Eyedropper can also tell you this. That bright lower leaf is about color (255, 0, 74), which is clipped in the red channel. But this Levels tool is real handy when critically adjusting exposure or white point. You can see what you are actually doing. [/QUOTE]

Verification