Blend level scale query

Bob Sneidar bobs at twft.com
Thu Nov 18 14:01:43 CST 2010


I believe the 1-100 is a measure of percentage, not the actual bit value for the alpha channel (or whatever they are doing there). 100 would then correspond to 255 (if I do not have it backwards). If you cannot use a decimal value for blendLevel then I think you are stuck with 100 levels. Is it easy to discern the difference between 50% and 51%? If not, the point is moot. 

Bob


On Nov 18, 2010, at 10:19 AM, Scott Rossi wrote:

> Not sure what you're looking for here David.  AFAIK, blendLevel is simply a percentage of opacity.  I have seen opacity treated in other tools using levels from 0 to 255, so I'm pretty sure finer increments of opacity are possible beyond those addressable in LC.
> 
> Regards,  
> 
> Scott Rossi
> Creative Director
> Tactile Media, UX Design
> 
> 
> On Nov 18, 2010, at 6:55 AM, David Glasgow <david at dvglasgow.wanadoo.co.uk> wrote:
> 
>> Can anyone say whether the LC blend level 
>> 
>> 1/ Corresponds to any particular model of transparency and opacity?
>> 
>> 2/ Can be described in units of some kind other than the LC 1-100?
>> 
>> 3/ Might approximate a linear scale?  (Although of course these things are very trick with perceptual stuff)
>> 
>> 4/  Gives reliably similar results across different machines & OSs?
>> 
>> Thanks,
>> 
>> 
>> Best Wishes,
>> 
>> David Glasgow
>> Carlton Glasgow Partnership
>> 
>> i-psych.co.uk
>> 
>> 
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