really hight K values from my step tables scan

[jaimeb82]

I printed and scanned a grayscale step tablet. When I opened up in photoshop to read the INPUT values from 0,5,10,15,20,25,30,35,40,45,50 I starting to get strange numbers like OUTPUT= 0,7,16,49,62,1543,4812,8611,12390,15676,18891. With those numbers I can not correct the curve of the histogram in levels.

Is my scan bad? I use a epson V500 flatbed scan and VueScan for scanning software. The tablet was provided by Ron Reeder's book, and I am following his book, but this is the first time I am giving digital negatives a try to be honest.

Any help regarding the issue with really high K values will help, thanks.

Jaime
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[donbga]

I printed and scanned a grayscale step tablet. When I opened up in photoshop to read the INPUT values from 0,5,10,15,20,25,30,35,40,45,50 I starting to get strange numbers like OUTPUT= 0,7,16,49,62,1543,4812,8611,12390,15676,18891. With those numbers I can not correct the curve of the histogram in levels.

Is my scan bad? I use a epson V500 flatbed scan and VueScan for scanning software. The tablet was provided by Ron Reeder's book, and I am following his book, but this is the first time I am giving digital negatives a try to be honest.

Any help regarding the issue with really high K values will help, thanks.

Jaime
Dead Link Removed

Your K values are being displayed in 16 bit values not 8 bit.

Don Bryant

 

[jaimeb82]

Thanks Don. I tried scanning at 8bit and also changing Image Mode to 8bit inside photoshop but my eyedropper info only reads 16bits K values. Thanks for the guidance Don.

 

[donbga]

but my eyedropper info only reads 16bits K values.

You have to make the change in PS. Your eyedropper can read 8 bit values or 16 bit values.

 

[jaimeb82]

Found it! you have to move the mouse over the eyedropper icon in the info window and changed from there. Should I read the values all the way from 0 to 100? Ron's book example goes only from 0 to 50 as INPUT values, at least in the first example.

 

[donbga]

Found it! you have to move the mouse over the eyedropper icon in the info window and changed from there. Should I read the values all the way from 0 to 100? Ron's book example goes only from 0 to 50 as INPUT values, at least in the first example.

Just keep things simple and continue to use Ron's workflow.