Denis de Gannes wrote:Where is the "Autocontrast" button/control located in ASP?
Denis de Gannes wrote:Will the Auto Levels button, in the Standard tab, provide a similar function.
afx wrote:Denis de Gannes wrote:Will the Auto Levels button, in the Standard tab, provide a similar function.
Depends on how you define similar
Autoleves is now relatively early in the pipeline, Autocontrast happens in the curve step very late.
Autolevels re-evaluates the image every time the pipeline is run and therefore is affected by anything that happens before it in the pipeline like crop or noise reduction that changes the luminance statistics depending on the image content. Autocontrast happens only at the time you click it.
The result of Autocontrast can be adjusted via the triangles in the curves tool, Autolevels is an all or nothing toggle.
afx wrote:The result of Autocontrast can be adjusted via the triangles in the curves tool, Autolevels is an all or nothing toggle.
It still is all or nothing, as it is either on or off. You can turn it on or off and it will work according to the thresholds you set. But it can not be fine tuned on top of that like Autocontrast which just sets the levels initially according to the thresholds and then can be tweaked further.Tadjio wrote:I don't understand this totally. AutoLevels can be adjusted by the 'Shadow Clip Percentage' and the 'Highlight Clip Percentage' so it isn't "all or nothing". (And AutoContrast uses the same Thresholds).
Tadjio wrote:I don't understand this totally. AutoLevels can be adjusted by the 'Shadow Clip Percentage' and the 'Highlight Clip Percentage' so it isn't "all or nothing". (And AutoContrast usees the same Thresholds).
gregglee wrote:[The bigger difference is continuous versus run once.
Auto level operates continuously, readjusting whenever many other tool settings are changed.
Auto contrast operates once only. Like autolevel it is affected by other tool settings at the time it runs, but does not continue to make changes. Whatever changes AC makes to curves remain fixed. (But is you make changes to other tools then run AC again, the result will be different.)
Slightly more subtle, in terms of interface AC moves the sliders on curves tool, much the same as moving them manually. AL changes the histogram, but does not reposition the sliders on the display. More like using exposure tools. So on curves tool it's as though AL repositions the startings point on the histogram for curve sliders. So adjusting sliders on top of AL is usually not the best technique. AC on top of AL is normally uselessly "of the chart." Either AL or AC, not both.
The need to adjust is a result of being broken. Manual tool adjust is easier than clip adjust. The idea (in Bibble5 anyway) is to set default clips to your taste and your equipment, then leave alone. If they work, great, if ot turn of an go manual. Perhaps also a couple presets with different clips for special situations like bird or aircraft in flight against sky, (I in fact have this one set up.)Tadjio wrote:My beef with AutoLevels is that I find I have to adjust the Thresholds too often (starting from 0.002) but I am hoping when the Highlights issues are resolved by Corel/Jeff that AutoLevels w ill be improved!
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