Hi Keith
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I'm a little confused about your comments regarding QTR-Linearize-Data vs QTR-Linearize-Quad.
The Linearize-Data script has been around a long time and its mainly to analyze measurement data files to extract
the L-values needed for the LINEARIZE capability in Profile Creation program.
I added dealing with Digital Negatives a while ago by adding the reverse order output from Linearize--Data
and changing the LINEARIZE function to accept reverse order data. (this is the only way because QTRgui is unmodifable)
LINEARIZE is different for negs because the correction is opposite.
Later than the above I added a Linearize-Quad script that analyzes measurement data like above but just immediately
applies this to an existing .quad file. (mostly this is useful for Piezo .quad's that don't go thru Profile Create)
The Linearize-Quad was not part of the digital negative linearizing since that's in Profile Create.
So I don9;t get the "I use QTR-Linearize-Quad frequently with PiezoDN" comment.
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Lastly -- yes you can use both GRAY_CURVE and LINEARIZE be used in the same QTR Curve.
Roy
On Thu, Dec 8, 2016 at 10:30 PM, Keith Schreiber keith@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:
Hi folks,I just tried using QTR-Linearize-Data for the first time and found that for linearizing digital negatives it works, but not quite as Roy described it here, unless I misunderstood something. I read the part quoted below to mean the input data in the text file for digital negs should be from black to white.QTR-Linearize-Data will not take numbers from black to white; whether Den or LAB, it gives the error message "The Lab values are not in order. Cannot be linearized."However, when a text file with numbers from white to black is dropped onto QTR-Linearize-Data, it produces both a standard white to black LINEARIZE= string, AND an inverted one, black to white, for digital negatives.LINEARIZE="88.18 83.49 75.44 69.33 66.12 63.64 61.83 60.05 57.75 55.53 51.78 48.73 45.82 42.59 38.68 34.25 30.54 27.43 24.22 22.41 20.68"For Digital Negative:LINEARIZE="20.68 22.41 24.22 27.43 30.54 34.25 38.68 42.59 45.82 48.73 51.78 55.53 57.75 60.05 61.83 63.64 66.12 69.33 75.44 83.49 88.18"This may not be news to anyone but me, but I thought I should mention it just in case. I've never used QTR-Linearize-Data before, though I use QTR-Linearize-Quad frequently with PiezoDN.One question though: Can both GRAY_CURVE and LINEARIZE be used in the same QTR Curve? I know at least one person who does that with digital negatives, and successfully I think, but I've never seen it discussed or written about anywhere.Cheers,KeithOn Sep 13, 2016, at 11:02 PM, Roy Harrington roy@harrington.com [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:For ordinary printing thevalues must be from White to Black, but for digital negatives use Black to White.LINEARIZE will create a correction curve such that the new curve set will producea step with linear Lab values -- i.e. it linearizes for Lab values.