Re: [udig-users] resolution lost on DRG

[Don <harterc1@xxxxxxxxxxx>]

Jody Garnett wrote:
> You are correct andrea; the functionality was intended more to handle
> a screen snap. If we wanted to edit a tiff file we would start to need
> specific tools (not a bad idea).
>
> The part that confuses me here is where Don is adding labels (ie human
> readable) but also expecting to export the full resolution of the
> original tiff file. This does not really
> make sense to me.
>
> Don perhaps you could describe what you are trying to accomplish - are
> you preparing something to print out? Or are you trying to construct a
> large image which you will pan around in ...
>
> Jody
>
>
> andrea antonello wrote:
>> Hi Don,
>>
>>  
>>> I have a DRG topo map.  I added it as a raster layer.  I then added a
>>> postgis layer which plotted points and added labels.  I then exported
>>> the resulting map to another tiff file.  When I view it and zoom in I
>>> seem to have lost the resolution that the original tiff file had.  How
>>> do I fix this?
>>>     
>>
>> If you exported the map with the export enigine I think by default the
>> map is exported at screenshot resolution.
>> I think, but am not sure right now, that Jesse added also the
>> possibility to set the scale. If that is the case, by changing the
>> scale you should be able to gain higher resolution.
>>
>> Andrea
>>
>>
>>  
>>> Here is information on the original tiff file:
>>> TIFFReadDirectory: Warning, O34086H1.TIF: unknown field with tag 33918
>>> (0x847e) encountered.
>>> TIFF Directory at offset 0xdf40 (57152)
>>>  Subfile Type: (0 = 0x0)
>>>  Image Width: 5589 Image Length: 6932
>>>  Resolution: 250, 250 pixels/inch
>>>  Bits/Sample: 8
>>>  Compression Scheme: PackBits
>>>  Photometric Interpretation: palette color (RGB from colormap)
>>>  Samples/Pixel: 1
>>>  Rows/Strip: 1
>>>  Planar Configuration: single image plane
>>>  Color Map: (present)
>>>
>>> It is 7.5" (1/24000) topo map.
>>> _______________________________________________
>>> udig-users mailing list
>>> udig-users@xxxxxxxxxxxxxxxxxxxxx
>>> http://lists.refractions.net/mailman/listinfo/udig-users
>>>
>>>     
>> _______________________________________________
>> udig-users mailing list
>> udig-users@xxxxxxxxxxxxxxxxxxxxx
>> http://lists.refractions.net/mailman/listinfo/udig-users
>>   
>
>
I am plotting locations on a map with an "x" an a label.  for  exapmle I
might want to plot all the cave locations with their names in a given
DRG.  I want to save that tiff file and  have users be able to look at
that new file.  They could use the file instead of having to know how to
use udig.   If you zoomed out to far then the labels would not be legible.