Hello out there,
I'm looking for advice regarding outputted tiff files using the Georeferencing - Rectify tool.
Currently I am setting the NoData to BLANK which displays black in the NoData sections.
Most other values will show the entire tiff as black.
Link to an example original file
I would like the NoData to be transparent.
The tiff gets control points added, Rectify is then used.
the NoData value gets deleted.
A compression type is selected.
Save is clicked.
Thanks!
Have you inspected the cells (info tool) to see what their values are, just in case they are now zero or some other value than nodsata
Hi Dan,
I can right click > properties and the nodata still shows blank/null. Thanks!
sorry... I meant the Identify tool to inspect the cell values
Hi Dan,
Yeah, I'm showing zeros.
Oooo a schematic... should have looked before.
Can you look at the histogram of the *tif ? I suspect and hope that has values of 0 and 255 ie black and white. But I suspect that something looks switched.
Maybe your black area is/was the non-line values, in which case a reclass maybe in order if you can't change your symboloby
Hi Dan,
I'm not familiar with histograms but I think this is what you are talking about:
Unfortunately I'm at a 0,1
You haven't any nodata values... it looks like 0 and 1, try unique values... if class 0 is your 'white' background, assign it no colour and if class 1 is the linework, assign it black
Just a guess:
The information posted shows "Pixel Depth" as being "1 Bit". I'm not an imagery expert, but in my mind that means something probably went awry, as there are not many values that can be stored with a 1 Bit pixel depth. Most imagery seems to be listed as at least "8 bit", as it is desirable to have a whole gradient of values.
Source: Color depth - Wikipedia
If you can, re-do the Rectify, paying attention to the options when saving the new image as to what Bit Depth is available.
Fundamentals of georeferencing a raster dataset—Help | ArcGIS for Desktop
Chris Donohue, GISP
Hi Chris,
I think you might be correct. My rectified tif has a high/low of 1/0
I don't think I have bit depth options after clicking Rectify.
Arcmap is the program being used.