[gdal-dev] Worldfile creation inconsistency with gdal_translate

[NeilJ]

Please can someone explain to me why I get the message "Waring 6: Driver
JPEG does not support WORDFILE creation option" when using gdal_translate on
a windows command line (FW Tools 2.4.7), when running:
gdal_translate -of JPEG -co WORDLFILE=YES -a_srs EPSG:27700 HP40SE.tif
F:\geo_streetview\jpg\HP40SE.jpg

The tif in question has the following details:

Driver: GTiff/GeoTIFF
Files: HP40SE.tif
Size is 5000, 5000
Coordinate System is:
PROJCS["unnamed",
    GEOGCS[,
        DATUM["unknown",
            SPHEROID["unretrievable - using WGS84",6378137,298.257223563]],
        PRIMEM["Greenwich",0],
        UNIT["degree",0.0174532925199433]],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AUTHORITY["EPSG","27700"]]
Origin = (445000.000000000000000,1205000.000000000000000)
Pixel Size = (1.000000000000000,-1.000000000000000)
Metadata:
  AREA_OR_POINT=Area
Image Structure Metadata:
  COMPRESSION=DEFLATE
  INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left  (  445000.000, 1205000.000)
Lower Left  (  445000.000, 1200000.000)
Upper Right (  450000.000, 1205000.000)
Lower Right (  450000.000, 1200000.000)
Center      (  447500.000, 1202500.000)
Band 1 Block=5000x1 Type=Byte, ColorInterp=Red Band 2 Block=5000x1
Type=Byte, ColorInterp=Green Band 3 Block=5000x1 Type=Byte, ColorInterp=Blue

I am very confused by the worldfile=yes option as I have used it before on
other conversions without a problem.

Any advice on when and why this does/doesn't work?
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