[Digikam-devel] [Bug 152527] Digikam can't read Image Size and Bit Depth of PNGs generated by UFRAW (latest stable)
Gilles Caulier
caulier.gilles at gmail.com
Mon Nov 19 07:23:06 GMT 2007
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http://bugs.kde.org/show_bug.cgi?id=152527
caulier.gilles gmail com changed:
What |Removed |Added
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Component|general |Metadata
------- Additional Comments From caulier.gilles gmail com 2007-11-19 08:23 -------
Arnd,
Here, this is not the fault to Exiv2, but KDE API and especially KFileMetaInfo...
Look in the code, at digikam/libs/imageproperties/imagepropertiestab.cpp, line 468
KFileMetaInfo do not search Exif info in PNG for that. It scan whole file to find PNG Chunk witch include image informations (PNG ImageHeader Tags : http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PNG.html#ImageHeader).
It's completly different than the way used by Exiv2 witch do not know (yet) this chunk, but only try to find the text chunk used to embed Exif informations as a byte-array (same for IPTC and XMP). Of course i can patch Exiv2 for that...
But this is not the real problem here. Now try to parse this image with exiftool like this :
exiftool -g DSC_0006_digikam.png
======== DSC_0006_digikam.png
---- ExifTool ----
ExifTool Version Number : 7.00
Warning : Bad NikonPreview directory
---- File ----
File Name : DSC_0006_digikam.png
Directory : .
File Size : 3 MB
File Modification Date/Time : 2007:11:19 07:50:02
File Type : PNG
MIME Type : image/png
Exif Byte Order : Little-endian (Intel)
---- PNG ----
Bit Depth : 16
Color Type : RGB
Filter : Adaptive
Interlace : Noninterlaced
Significant Bits : 16 16 16
Source : NIKOND80
Software : digiKam 0.9.2-final ( libpng version 1.2.15beta5 - December 8, 2006 (header) )
IPTC Profile : (Binary data 134611 bytes, use -b option to extract)
---- ICC_Profile ----
Profile CMM Type : scrs
Profile Version : 2.1.0
Profile Class : Display Device Profile
Color Space Data : RGB
Profile Connection Space : XYZ
Profile Date Time : 2001:04:12 19:02:14
Profile File Signature : acsp
Primary Platform : Microsoft Corporation
CMM Flags : Not Embedded, Independent
Device Manufacturer : none
Device Model : none
Device Attributes : Reflective, Glossy, Positive, Color
Rendering Intent : Perceptual
Connection Space Illuminant : 0.9642 1 0.82491
Profile Creator : scrs
Profile ID : 0
Profile Description : Wide Gamut RGB
Profile Copyright :
Media White Point : 0.9642 1 0.82491
Media Black Point : 0 0 0
Red Matrix Column : 0.71651 0.25874 0
Green Matrix Column : 0.10103 0.72469 0.05122
Blue Matrix Column : 0.14679 0.0166 0.7739
Red Tone Reproduction Curve : (Binary data 524 bytes, use -b option to extract)
Green Tone Reproduction Curve : (Binary data 524 bytes, use -b option to extract)
Blue Tone Reproduction Curve : (Binary data 524 bytes, use -b option to extract)
---- EXIF ----
Processing Software : digiKam-0.9.2-final
Subfile Type : Full-resolution Image
Image Width : 684
Image Height : 1024
Bits Per Sample : 12
Compression : Nikon NEF Compressed
Photometric Interpretation : Color Filter Array
Document Name : DSC_0006.png
Make : NIKON CORPORATION
Camera Model Name : NIKON D80
Orientation : Horizontal (normal)
Samples Per Pixel : 1
X Resolution : 300
Y Resolution : 300
Planar Configuration : Chunky
Resolution Unit : inches
Modify Date : 2007:09:30 15:58:25
Reference Black White : 0 255 0 255 0 255
CFA Repeat Pattern Dim : 2 2
CFA Pattern 2 : 1 2 0 1
Exposure Time : 1/200
F Number : 5.3
Exposure Program : Program AE
ISO : 500
Create Date : 2007:09:30 15:58:25
Exposure Compensation : 0
Max Aperture Value : 5.1
Metering Mode : Center-weighted average
Flash : No Flash
Focal Length : 58.0mm
User Comment :
Sub Sec Time : 50
Sub Sec Time Original : 50
Sub Sec Time Digitized : 50
Exif Image Width : 684
Exif Image Length : 1024
File Source : Digital Camera
Scene Type : Directly photographed
Custom Rendered : Normal
Exposure Mode : Auto
Digital Zoom Ratio : 1
Focal Length In 35mm Format : 87mm
Scene Capture Type : Standard
Gain Control : Low gain up
Contrast : Normal
Saturation : Normal
Sharpness : Normal
Subject Distance Range : Unknown (0)
Date/Time Original : 2007:09:30 15:58:25
TIFF-EP Standard ID : 1 0 0 0
Sensing Method : One-chip color area
Thumbnail Offset : 13487
Thumbnail Length : 3584
---- MakerNotes ----
Maker Note Version : 2.10
Color Mode : Color
Quality : Raw
White Balance : Auto
Focus Mode : AF-A
Flash Setting : Slow
Flash Type :
White Balance Fine Tune : 0
Color Balance 1 : 1.62109375 1.62109375 1 1
Program Shift : 0
Exposure Difference : 0
Flash Exposure Compensation : 0
ISO Setting : 500
Flash Exposure Bracket Value : 0.0
Exposure Bracket Value : 0
Crop Hi Speed : Off (3904x2616 cropped to 3904x2616 at pixel 0,0)
Serial Number : 5001393
Color Space : sRGB
Tone Comp : Auto
Lens Type : G
Lens : 18-135mm f/3.5-5.6
Flash Mode : Did Not Fire
AF Area Mode : Single Area
AF Point : Left
AF Points In Focus : Left
Shooting Mode : Single-Frame
Auto Bracket Release : Manual Release
NEF Curve 1 : (Binary data 8256 bytes, use -b option to extract)
Light Source : Natural
Hue Adjustment : 0
Noise Reduction : Off
NEF Curve 2 : (Binary data 1412 bytes, use -b option to extract)
Raw Image Center : 1952 1308
Sensor Pixel Size : 6.05 x 6.05 um
Shutter Count : 853
Image Optimization : Normal
Vari Program :
Multi Exposure Version : 0100
Multi Exposure Mode : Off
Multi Exposure Shots : 0
Multi Exposure Auto Gain : Off
High ISO Noise Reduction : Normal
Shot Info Version : 0208
Vibration Reduction : Off, Rotated 270 CW
WB RGGB Levels : 415 256 256 415
Lens Data Version : 0202
Exit Pupil Position : 102.4mm
AF Aperture : 5.0
Focus Position : 0x04
Focus Distance : 3.98 m
Lens ID Number : 143
Lens F Stops : 5.33
Min Focal Length : 18.3mm
Max Focal Length : 134.5mm
Max Aperture At Min Focal : 3.6
Max Aperture At Max Focal : 5.7
MCU Version : 145
Effective Max Aperture : 5.2
---- Composite ----
Aperture : 5.3
Blue Balance : 1.621094
CFA Pattern : [Green,Blue][Red,Green]
Image Size : 684x1024
Lens ID : AF-S DX Zoom-Nikkor 18-135mm f/3.5-5.6G IF-ED
Lens : 18-135mm f/3.5-5.6 G
Red Balance : 1.621094
Scale Factor To 35mm Equivalent : 1.5
Shutter Speed : 1/200
Thumbnail Image : (Binary data 3584 bytes, use -b option to extract)
Circle Of Confusion : 0.020 mm
Depth of Field : 1.00 m (3.54 - 4.54)
Focal Length : 58.0mm (35mm equivalent: 87.0mm)
Hyperfocal Distance : 31.69 m
Light Value : 10.1
Date/Time Original : 2007:09:30 15:58:25.50
All tags with an hexa number on starting line come from Exif/Makernotes embeded in text chunk like digiKam or Imagemagick do (i'm sure, i have talking about this subject with UFRAW author in Exiv2 mailing list)
Now look where are Dimensions, Compression, bit depth, and color mode ? Only on Exif byte array, not on PNG ImageHeader Tags...
Conclusion : i suspect than :
- this file is corrupted or uncomplete (where are dimension and compression infos ?)
- and something is wrong on KFileMetaInfo (why at least Bit Depth and Color Type are not found ?)
Gilles
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