Outline

I see now what you are after. And ISTM the easiest approach for that would be to Blutak clear plastic (eg an OHP transparency) to the top of the monitor and draw on that the reference spectrum. With a Sharpie shouldn't be far short of what you'd get with screen grabn and a lot faster?

Reply to
Robin
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Strange. That's exactly what I've been doing with my 'hand drawn' outline. All you need is a vector based prog that can show pixel based ones.

Reply to
Dave Plowman (News)

How is that any quicker than drawing over the outline using a vector based prog? Which you can easily correct if you make a mistake?

Reply to
Dave Plowman (News)

In message , "Dave Plowman (News)" writes

I don't know whether it would work for this, but I have a program here that I downloaded from Giveawayoftheday called "Sketch Drawer" from

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It is supposed to take a photo and produce a line drawing from it. It didn't help with the wife's art............

Reply to
Bill

Ah, do you mean with both curves in use in the same program?

I was thinking in terms of looking at the two screenshots in separate viewing windows of one or two graphics apps.

Reply to
Jeremy Nicoll - news posts

I had thought you'd leave the transparency in place so subsequent spectrums appeared underneath it and you would see instantly how they compared to your target without any dragging or whatever. But I suspect I have after all still not understood just what you want to do and your options for doing it in RISC so I'll butt out.

Reply to
Robin

You can do all this sort of thing in Excel. Graphs and everything.

Here are some notes I made. Probably not all that easy to follow.

Blank workbook. Feed first three angle values into column A, cells 1, 2, 3. Drag across cells to multiple select. Drag bottom right to extend series to 355. Feed dB values into column B, cells 1, 2, 3, 4, etc.

To enter one series only Multiple-select all used cells in column B. Insert > Other charts > Radar (left one of the three).

OR ALTERNATIVELY To enter one or more series Insert > Other charts> Radar (left one of the three). Chart should be blank. Rt click on chart > select data > add Enter a name (optional). Delete the ={1} already in the lower box. Enter a series value by clicking in that box then dragging down column B (or C for a further series, etc). > OK

To set the scale (primary axis) max and min values Maximum value should be the max forward gain Minimum should be the max forward gain minus 46, to give a 46dB range.

Layout > Axes > Primary vertical axis > More Primary vertical axis options OR Layout > Select the Value Axis numbers on the chart, then, (top left) ?format selection? THEN Set max/min etc to fixed. Alter the numbers. Close

To format the outline Format> Click on the outline to select it (Top left): ?format selection?

To import into CorelDraw In Excel: Home > copy In CorelDraw: Edit > Paste

Bitmaps > convert to bitmap Rotate> -90 OR Trace from the Worksheet Object (as it has become) then delete it, and rotate the tracing.

or

In Excel: Home > copy In CorelDraw: Edit > Paste Trace shape Rotate> -90

To find the average of levels for 90° through to 270° in order to find the average f/b ratio Multiple select cells 19B - 55B Auto sum average

f/b ratio is level in cell 1A minus average of cells 19B-55B

Bill

Reply to
Bill Wright

I think one of the problems here is that the OP isn't looking for a manual process to do once, but something he can do quickly (perhaps automatically) multiple times. That would make your sort of solution tricky unless one could use a macro / automation tool to replicate it - and that would require similar programming expertise to the sort of thing I suggested.

Reply to
Jeremy Nicoll - news posts

Or use transparencies. Like these:

Reply to
Bill Wright

And a lot less easy than letting an edge detection filter do its magic!

Reply to
Tim Watts

Select the background colour to the gif to be the transparent one, and then layer them....

(failing that, lob them to me, and I will merge them in photoshop)

Reply to
John Rumm

Don't think I'd be happy with a transparency permanently draped over this monitor. ;-) And of course it would have to be very carefully aligned each time to be of any use. Think I'll continue looking for an electronic answer.

I'm not worried whether it's Windows or RISC OS prog(s) needed to do it - as all these sort of files can be read by either these days.

Reply to
Dave Plowman (News)

Since there seems to be some confusion about what I want, here is a rather low res JPEG of the desired end result. The black line was hand traced over the 'ideal' analysis and overlaid on top of an actual one.

formatting link

Reply to
Dave Plowman (News)

That's helpful. But I'm still in the dark about how often you want to do this (-> how automated it has to be) and what skills and software you already have at your disposal.

Reply to
Mike Barnes

I'd ask in rec.photo.digital. I have a feeling that it won't be as easy as it looks like it should be.

Reply to
RJH

As often as I want or need to would be the obvious answer. If it were just once I'd not be asking because as you can see I've found a way of doing it.;-)

Again that should be obvious. Considerably quicker than doing it by hand.

Rather more than most here, judging by some of the replies. ;-)

I would normally view the end result on ProCad Plus if using the RISC OS machine, or Draftsight on the PC. Purely because I'm most familiar with them. I'm not averse to buying something that would do exactly what I want

- but not on the 'it might work' sort of recommendation.

Reply to
Dave Plowman (News)

I'm coming to that conclusion too. ;-)

Reply to
Dave Plowman (News)

Well, yes, I can see that *now*.

Can I suggest that scraping an Audacity screen might not be the best place to start?

Reply to
Mike Barnes

Since you've no idea what I'd doing how can you possibly know?

Reply to
Dave Plowman (News)

I did say "might".

Reply to
Mike Barnes

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