How is "luminance percentage" calculated in Lightroom 3.3?

Does anybody out there know exactly how Lightroom calculates the "luminance percentage" in Lightroom 3.3? To be more specific: when you are in the Develop module and you hover your cursor over the image, a "luminance percentage" is shown for each channel for the pixel underneath your cursor. What exactly is this a percentage of? The three percentages don't add up to 100 percent, so clearly it's not a simple calculation along those lines. I've also noticed that if you create some files in Photoshop that have uniform color throughout (exactly the same RGB values everywhere in the image) then bring them into Lightroom, the "luminance percentage" for a particular channel will vary even if the RGB values remains constant. For example, a file filled with the color 10, 120, 150, (R, G, B) shows that the luminance percentage for the red channel is 29 percent. For a file with RGB values of 10, 75, 65, the luminance percentage for the red channel is shown as 13.3 percent even though the red value is the same. Sooner or later one of my students is going to ask me where those numbers come through, and I'd like to have the answer! I can't find the answer searching Adobe help or this forum. Thanks to whoever has the answer!
Glenn Randall

I'll go out on a limb and answer that it's the percentage of the 16-bit color number itself made by applying an SRGB tone curve to the internal linear ProPhotoRGB working space. See "Melissa RGB".

Similar Messages

How is luminance calculated?

Hi,
I'm using the Color Plane Extraction function on Vision Assistant to extract an the luminance plane of an image, but was wondering how exactly the luminance is calculated? Also, what is the difference between luminance and intensity?
Thanks!

http://en.wikipedia.org/wiki/Luminance
While luminance is rather clearly defined, intensity isn't. It could be synonimous to luminance intensity but it can also mean a number of other things.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

How can I do calculation positioning in crosstab?

I have a calculation that should be displayed in only one column, at the right of a crosstab. Discoverer insists to copy my calculation under all columns, repeating the same result under each.
Is their a way to fix it at one place?

this is an example of how you can accomplish this with Region along the x-axis.
You need to do the same thing with the ages to get age along the x-axis.
I'm not sure it is an ideal solution given the large range of ages.
For each region, create a calculation as follows:
Calculation named 'Region A'
SUM(DECODE(Region,'Region A',[person count])
Calculation named 'Region B'
SUM(DECODE(Region,'Region B',[person count])
Calculation named 'Region Z'
SUM(DECODE(Region,'Region Z',[person count])
Then a final calculation, to get the percentage:
Calculation named 'All regions'
something like
(SUM([person count]) OVER (Parition by AGE])) / SUM[person_count]
which will divide the [person count] for that row (age) by the total [person count].
To get Age along the x-axis you need to create a calculation for each age, and the final calculation will be
(SUM([person count]) OVER (Parition by Region])) / SUM[person_count]

Percentage calculation on query designer (7.0)

Hi experts,
I´m new on Query designer (7.0) and I´m trying to do a finnancial report, so for the lines I create and structure using G/L accounts and in the columns I got the amount for each level in my structure for a month. Now I´m trying to create an Integration percentage, it specifies how high the percentage in a level is in relation to next higher level but so far I couldn't make it...
My report must seem like this:
Structure.............................Amount ...... Int %
1. Assets................................1000 ....... 100%
1.1 Current assets.................... 600 ....... 60%    -> (600/1000)*100
- Cash............................. 300 ........ 50%    -> (300/600)*100
- Inventories..................... 300 ........ 50%    -> (300/600)*100
1.2 Long-term assets................ 400 ....... 40%    -> (400/1000)*100
- Property, plant and eq..... 150 ....... 37.5% -> (150/400)*100
- Investment property......... 150 ....... 37.5% -> (150/400)*100
- Intangible assets..............100 ....... 25%    -> (100/400)*100
I try to use each Percentage calculation options (%, %A, %CT,%GT, %RT) but it didn't work. Can anyone help me in creating a formula to get this percentage?
Thanks

Hi,
check this notes and links to get an overview how to use:
III. List Calculations (e.g.'Calculate result as..'):Interesting facts about the OLAP Processor/Analytic Engine
SAP Note Number: [1151957|https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes/sdn_oss_bw_bex/~form/handler%7b5f4150503d3030323030363832353030303030303031393732265f4556454e543d444953504c4159265f4e4e554d3d31313531393537%7d]
If, in a structure element (key figure ID), you use the 'Calculate Results as' and 'Calculate Single Value as' properties with their additional fields at the same time, priority problems occur and the system behavior is not immediately clear.:
Calculate Results/Single Values as ... priority rules
SAP Note Number: [853058 |https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes/sdn_oss_bw_bex/~form/handler%7b5f4150503d3030323030363832353030303030303031393732265f4556454e543d444953504c4159265f4e4e554d3d383533303538%7d]
Regards
Andreas

Percentage Calculation for result rows

Hi
I have problem with percentage calculation on result rows. I have 2 KFs A and B, the result is calulated by setting 'calculate result rows as' to 'summation'.
But in KF 'C' (which is calculated as A/B*100 ),
Now the probles is the systen picks up original values of A and B for calculation of C in result rows.
i.e. system picks up values of result rows for A and B for
setting 'calculate result rows as' to 'nothing defined'.
Any ideas on how to fix this.
Thanks
Karen

Karen
I found something in Forum for you
Result Rows Calculation
Pradip's Solution should work. Try and if it is don't forget to award points.
Regs
Gopi

Percentage calculation error?

Hi guys,
I must be missing something very basic - I can't get a simple percentage calculation to work in an applet:
float percentage = 0;
int amount,total;
amount = 4;
total = 10;
percentage = (float)((amount / total) * 100);
Instead of returning 40.0 in "percentage", this keeps returning 0.0...
What am I doing wrong? How do you calculate a percentage in Java?
Thanks!

do the type casting of either of total or amount
Gaurav

Percentage calculation according a result

Hi,
I have an issue with a percentage calculation in a query.
As rows I have Product Hierarchy 1, Product Hierarchy 2 and Material. I would like to show the sales for each material as a percentage of the result by Product Hierarchy 2 and in another colunm the percentage according the result by Product Hierarchy 1. I have used the option "Normalized according to the next level.." and it works to calculate the percentage according Product Hierarchy 2, but how can i manage to calculate the percentage according to Product Hierarchy 1( it is not the next level of the hierarchy, it would be the second next level)?
Thanks in advance.

Hi ,
check this link ..
http://help.sap.com/saphelp_nw70/helpdata/EN/ee/37e80557494542806a38498d99a463/content.htm
Hope this helps ...
Regards,
Shikha

Percentage calculation based on subtotal in webi 4.0

Hi Experts ,
How do i calculate the % column in webi 4.0 so that % would be calculated by the amount of Primary channel / Subtotal ) in one block.
=[Amount Of promary Channel]/Sum([Amount Of promary Channel]) In Block - not giving correct output.
Thanks,
Rajib

Hi Rajib, As per my understanding, you want to show percentage on the base of subtotal.
that means if you set break on the Compony then percentage column should contain the percentage calculated on the basis of compony subtotal.
like this...(just one block of break)
then just use the simple percentage function ( =percentage(amount) ), this will automatically calculate the percentage based on subtotal.
and if you want to show 100% in subtotal row also then you can use formula= (amount/sum(amount)),
i think we dont need to use contex operator here.
formula for AHW total row = amount/sum(amount)
Let me know if this will help you,
Thanks,
Nitin

Crystal report 2011 percentage calculation(Urgent)

All,
I am working on a report which looks like the below.
product>>>>>>> revenue>>>>>>>>> growth percentage
a >>>>>>>>>>>     12 >>>>>> >>>>               48%
b >>>>>>> >>>>>>>13 >>>>>>>>                  52%
c >>>>>>>>>>>>>   14 >>>>>>>>>
d>>>>>>>>>>>>>> 16>>>>>>>>>>>>
total         >>>>>>>   25 >>>>>                          100%
my requirement is to calculate the individual growth percentage of a and b with the total revenue of a and b only.
to be more specific 12 divided by 25 and then 13 divided by 25.
i want these growth percentages in growth percentage column in my report.
I achieved the selective summation of revenue for a and b in the report footer but i am not able to use the total revenue 25 (that i get in the report footer) in the body of the report(detail section) for growth percentage calculation.
I tried using shared variables and global variables but of no use.i am not able to assign the grand total in the footer to a variable in the detail section in order to calculate the growth percentage.
Is there any easy work around to achieve this? need urgent help.
I also tried running totals and stuff but of no use.
Any help would be appreciated.
Reji.
Edited by: reji2011 on Jan 22, 2012 7:32 PM

Hi Reji,
I'm not sure how you've added 'a' and 'b', however, whatever way it would be, I'm sure it would be a print time formula.
Meaning it is calculated a later stage after all the records are printed. So, you would never be able to use a value in the Report Footer or any Footer to calculate against a detail section value and show the calculation on the detail section itself.
The way I see it, you would need to insert this report as a sub-report, just to calculate a + b, store this value in 'shared variable' and use it for calculations in the Main Report.
So, in the sub-report, where you have your formula that calculates the addition of a and b, just create a shared variable and assign this value to it.
Place the sub-report on the Report Header and in the Main report create a formula that calls the shared variable. You can then use this formula/variable in Main-report's calculations.
Hope this helps!
-Abhilash

How is utilization index calculated?

Hi there,
When I create a dashboard widget, I can select from top highest or top lowest utilization. I am curious how the utilization is calculated? Is it average over all metrics or is there some sampling?
Thanks,
-Nigel

In other words, if I take a 10 mpx file, a 16 mpx file, a 24 mpx file and a 40 mpx file; at 100% zoom they will all display 1,680 x 1,050 pixels of that file?
Exactly! Lightroom calls it 1:1 instead of 100% but that is a detail.
So when you are looking at a 10 MP file at 1:1 you see the equivalent of a crop from a 30x20" print, with 16 MP a crop from a 38*25" print, with 24MP, a crop from a 47x31" print and with a 40MP file, a crop from a 60x40" print.
I do these calculations more often as you might be able to tell ;-)

How is 100% Zoom Calculated?

In reading a similar post for Photoshop Elements, the respondent indicated that a 100% zoom is where one pixel from the camera is displayed as one pixel on the monitor. So, if my monitor has a display of 1,680 x1,050 and it has a diaganol dimension of 15.4" and I am doing a 100% zoom on a 16.2 mpx file (4,912 x 3,264) how is this magnification calculated?
Thanks
Earl

In other words, if I take a 10 mpx file, a 16 mpx file, a 24 mpx file and a 40 mpx file; at 100% zoom they will all display 1,680 x 1,050 pixels of that file?
Exactly! Lightroom calls it 1:1 instead of 100% but that is a detail.
So when you are looking at a 10 MP file at 1:1 you see the equivalent of a crop from a 30x20" print, with 16 MP a crop from a 38*25" print, with 24MP, a crop from a 47x31" print and with a 40MP file, a crop from a 60x40" print.
I do these calculations more often as you might be able to tell ;-)

Why I can not find the percentage calculation %ct

Hi,
I m trying to use the Percentage Calculation %ct for a calculated KeyFigure. There are only two Functions: % and %A
Can anyone explain why it is so?
thanks and regards

Hi,
Percentage Variance (%)
<Operand1> % <Operand2>
This gives the percentage variance between operand 1 and operand 2.
Percentage Share (%A)
<Operand1> %A <Operand2>
This gives the percentage share of operand 1 and operand 2. It is identical to formula 100 * <Operand1> / abs(<Operand2>) , if <Operand2> is not equal to 0 and the character for u201CDivision by 0u201D if <Operand2> is equal to 0.
Use
You use the following percentage functions as operators when you define a formula or a calculated key figure.
Features
NULL values are displayed as empty cells, not as 0. For more information about when NULL values occur and how they are displayed, see Technical Notes About the Formula Operators.
Percentage Variance (%)
<Operand1> % <Operand2>
This gives the percentage variance between operand 1 and operand 2. It is identical to:
Formula 100 * (<Operand1> - <Operand2>) / abs(<Operand2>) , if <Operand2> is not equal to 0 and the character for u201CDivision by 0u201D if <Operand2> is equal to 0.
Plan Sales % Actual Sales specifies the percentage difference between the plan sales and the actual sales.
Percentage Share (%A)
<Operand1> %A <Operand2>
This gives the percentage share of operand 1 and operand 2. It is identical to formula 100 * <Operand1> / abs(<Operand2>) , if <Operand2> is not equal to 0 and the character for u201CDivision by 0u201D if <Operand2> is equal to 0.
Character for "Division by 0" :See SAP Reference IMG u2192 SAP Customizing Implementation Guide u2192 SAP NetWeaver u2192 Business Intelligence u2192 Settings for Reporting and Analysis u2192 General Settings for Reporting and Analysis u2192 Display of Numeric Values in the Business Explorer.
"Fixed costs" %A "costs" expresses the proportion of the total cost of a product that is the fixed cost.
Percentage Share of Result (%CT)
%CT <Operand>
This shows how high the percentage share is, with regard to the result. The result is the outcome of aggregating the second highest results level (interim result).
Use
You use the following percentage functions as operators when you define a formula or a calculated key figure.
Features
NULL values are displayed as empty cells, not as 0. For more information about when NULL values occur and how they are displayed, see Technical Notes About the Formula Operators.
Percentage Variance (%)
<Operand1> % <Operand2>
This gives the percentage variance between operand 1 and operand 2. It is identical to:
Formula 100 * (<Operand1> - <Operand2>) / abs(<Operand2>) , if <Operand2> is not equal to 0 and the character for u201CDivision by 0u201D if <Operand2> is equal to 0.
Plan Sales % Actual Sales specifies the percentage difference between the plan sales and the actual sales.
Percentage Share (%A)
<Operand1> %A <Operand2>
This gives the percentage share of operand 1 and operand 2. It is identical to formula 100 * <Operand1> / abs(<Operand2>) , if <Operand2> is not equal to 0 and the character for u201CDivision by 0u201D if <Operand2> is equal to 0.
Character for "Division by 0" :See SAP Reference IMG u2192 SAP Customizing Implementation Guide u2192 SAP NetWeaver u2192 Business Intelligence u2192 Settings for Reporting and Analysis u2192 General Settings for Reporting and Analysis u2192 Display of Numeric Values in the Business Explorer.
"Fixed costs" %A "costs" expresses the proportion of the total cost of a product that is the fixed cost.
Percentage Share of Result (%CT)
%CT <Operand>
This shows how high the percentage share is, with regard to the result. The result is the outcome of aggregating the second highest results level (interim result).
If a characteristic has been drilled down in both the rows and the columns, this reference is not unique. The system displays a warning and the relevant symbol for Data Does Not Exist. For more information, see SAP Reference IMG u2192 SAP Customizing Implementation Guide u2192 SAP NetWeaver u2192 Business Intelligence u2192 Settings for Reporting and Analysis u2192 General Settings for Reporting and Analysis u2192 Display of Numeric Values in the Business Explorer.
Percentage Share of Overall Result (%GT)
%GT <Operand>
This shows how high the percentage share is with regard to the overall result. The overall result is the outcome of aggregating the highest results level. Dynamic filters (filters that were not specified in the Query Designer) also play a role in calculating the overall result.
Percentage Share of Query Result (%RT)
%RT <Operand>
This is the same as %GT.
Unlike the process for calculating the overall result, dynamic filters are not used in the calculation of the query result. This means that the calculation always normalizes to the same value, irrespective of the filter status and the navigational state.
Reg
Pra

How to calucate percentage

I need a formula to calculate a total percent of goal so far.
So here is the problem;
The Goal to collect is: $2,300.00
So far this amount has been donated: $350.00
I want to show to the user the percentage so far collected, the image that I will show will have a 0% to 100% graph . Any thoughts on how to do the calculation.
Thanks




<cfset percentCollected = round(100*350/2300)>
<cfset percentDue = round(100*1950/2300)>

<cfchart format="png">

<cfchartseries type="pie">
<cfchartdata item="Collected" value="#percentCollected#">
<cfchartdata item="Due" value="#percentDue#">
</cfchartseries>
</cfchart>

How many times can you install Lightroom 5? My problem is that I have saved my programs on C. To I have more space, I want to save my programs now on E. Can I now uninstall Lightroom and reinstall from C to E? Can I use the same license code as the first

Please help!!
How many times can you install Lightroom 5? My problem is that I have saved my programs on C. To I have more space, I want to save my programs now on E. Can I now uninstall Lightroom and reinstall from C to E? Can I use the same license code as the first installation?

Thank you for your answers, it helps me a lot.
But sorry for my ignorance. I understand how you mean it, but I don't know how to do it. I'm scared to lose the settings/edits of the images.

How do i purchase license for lightroom 5? When i tried to process payment, it says There was a problem processing your order, please contact our Customer Service team on 800 448 1642 for assistance.

How do i purchase license for lightroom 5? When i tried to process payment, it says There was a problem processing your order, please contact our Customer Service team on 800 448 1642 for assistance.

In this forum, we can't help with purchasing issues.
My suggestion is to call that phone number.

How is "luminance percentage" calculated in Lightroom 3.3?

Similar Messages

Maybe you are looking for