Opened 16 years ago

Closed 16 years ago

#2572 closed defect (fixed)

fixed

Reported by: winkey Owned by: Even Rouault
Priority: normal Milestone:
Component: GDAL_Raster Version: svn-trunk
Severity: normal Keywords: overview extra sample
Cc:

Description

I did notice Extra Samples: 1<assoc-alpha> seems to missing from the overviews

[ldm@atmos ike]$ tiffinfo testy.tiff
TIFFReadDirectory: Warning, Unknown field with tag 33550 (0x830e) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 33922 (0x8482) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 34735 (0x87af) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 34737 (0x87b1) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 42113 (0xa481) encountered.
TIFF Directory at offset 0x6e00e7a (115347066)
  Image Width: 4901 Image Length: 5441
  Tile Width: 256 Tile Length: 256
  Bits/Sample: 8
  Sample Format: unsigned integer
  Compression Scheme: None
  Photometric Interpretation: RGB color
  Extra Samples: 1<assoc-alpha>
  Samples/Pixel: 4
  Planar Configuration: single image plane
  Tag 33550: 0.000003,0.000003,0.000000
  Tag 33922: 0.000000,0.000000,0.000000,-95.213176,29.770886,0.000000
  Tag 34735: 1,1,0,5,1024,0,1,2,1025,0,1,1,2048,0,1,4326,2049,34737,7,0,2054,0,1,9102
  Tag 34737: WGS 84|
  Tag 42113: 255
TIFF Directory at offset 0x6e01da8 (115350952)
  Subfile Type: reduced-resolution image (1 = 0x1)
  Image Width: 2451 Image Length: 2721
  Tile Width: 128 Tile Length: 128
  Bits/Sample: 8
  Sample Format: unsigned integer
  Compression Scheme: None
  Photometric Interpretation: RGB color
  Samples/Pixel: 4
  Planar Configuration: single image plane
TIFF Directory at offset 0x6e02c1a (115354650)
  Subfile Type: reduced-resolution image (1 = 0x1)
  Image Width: 1226 Image Length: 1361
  Tile Width: 128 Tile Length: 128
  Bits/Sample: 8
  Sample Format: unsigned integer
  Compression Scheme: None
  Photometric Interpretation: RGB color
  Samples/Pixel: 4
  Planar Configuration: single image plane
TIFF Directory at offset 0x6e0303c (115355708)
  Subfile Type: reduced-resolution image (1 = 0x1)
  Image Width: 613 Image Length: 681
  Tile Width: 128 Tile Length: 128
  Bits/Sample: 8
  Sample Format: unsigned integer
  Compression Scheme: None
  Photometric Interpretation: RGB color
  Samples/Pixel: 4
  Planar Configuration: single image plane
TIFF Directory at offset 0x6e031de (115356126)
  Subfile Type: reduced-resolution image (1 = 0x1)
  Image Width: 307 Image Length: 341
  Tile Width: 128 Tile Length: 128
  Bits/Sample: 8
  Sample Format: unsigned integer
  Compression Scheme: None
  Photometric Interpretation: RGB color
  Samples/Pixel: 4
  Planar Configuration: single image plane
TIFF Directory at offset 0x6e032d8 (115356376)
  Subfile Type: reduced-resolution image (1 = 0x1)
  Image Width: 154 Image Length: 171
  Tile Width: 128 Tile Length: 128
  Bits/Sample: 8
  Sample Format: unsigned integer
  Compression Scheme: None
  Photometric Interpretation: RGB color
  Samples/Pixel: 4
  Planar Configuration: single image plane
[ldm@atmos ike]$ 

Change History (5)

comment:1 by Even Rouault, 16 years ago

Yes, indeed. But does it cause problems ? You can also notice we don't reproduce the GeoTIFF tags in overviews neither.

comment:2 by winkey, 16 years ago

when i added overviews to to images with an alpha channel the overviews came out totaly transparent my only guess is its picking up the wrong band as the alpha channel, the images were created by gdalwarp

comment:3 by Even Rouault, 16 years ago

winkey,

I've commited in r15393 the code that duplicates the ExtraSamples tag in overviews. Could you confirm that it solves your issue ?

By the way, which viewer are you using ? (there's a high chance I've no access to it if it is not open source ;-))

comment:4 by Even Rouault, 16 years ago

Component: UtilitiesGDAL_Raster
Keywords: overview extra sample added
Owner: changed from warmerdam to Even Rouault
Status: newassigned

comment:5 by winkey, 16 years ago

Resolution: fixed
Status: assignedclosed
Summary: overviews on images with a alpha channel don't seem to workfixed

all is well now, thank you

viewers were

gdalwarp -dstalpha.... -> gdaladdo -> mapserver (gdal/png) -> Google earth
                                                           |
                                                           -> openlayers/seamonkey

gdalwarp -dstalpha.... -> gdaladdo -ro ext.ovr -> eog
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