Annons

"Exposure Time" och "Target Exposure Time" EXIF information

Produkter
(logga in för att koppla)

jeskata

Aktiv medlem
Märkte att exiftool visar tre, eller egentligen två olika värden på exponeringstid i RAW-filer.
Ena är "Target Exposure Time" och andra är "Exposure Time" och "Shutter Speed".
Är det möjligt att den faktiskt håller reda på hur länge slutaren har varit öppen? Det verkar variera, ibland är den ena större, ibland den andra.

Källkod:
$ exiftool crw_1924.crw
ExifTool Version Number         : 6.13
File Name                       : crw_1924.crw
File Size                       : 6 MB
File Modification Date/Time     : 2006:04:23 13:43:40
File Type                       : CRW
MIME Type                       : image/x-raw
Raw Data                        : (Binary data 6140144 bytes, use -b option to extract)
Jpg From Raw                    : (Binary data 475162 bytes, use -b option to extract)
File Format                     : CRW
Target Compression Ratio        : 10
Image Width                     : 3072
Image Height                    : 2048
Pixel Aspect Ratio              : 1
Rotation                        : 270
Component Bit Depth             : 8
Color Bit Depth                 : 24
Color BW                        : 257
Target Image Type               : Real-world Subject
Record ID                       : 0
File Number                     : 419-1924
Date/Time Original              : 2006:04:23 13:43:18
Time Zone Code                  : 0
Time Zone Info                  : 0
Original File Name              : CRW_1924.CRW
Thumbnail File Name             : CRW_1924.THM
User Comment                    :
Measured EV                     : 8.25
Canon File Description          : EOS 300D DIGITAL CMOS RAW
Canon Image Type                : CRW:EOS 300D DIGITAL CMOS RAW
Owner's Name                    :
Make                            : Canon
Camera Model Name               : Canon EOS 300D DIGITAL
Camera Body No.                 : 0470033766
Base ISO                        : 100
ROM Operation Mode              : USA
Canon Firmware Version          : Firmware Version 1.1.1
Focal Length                    : 50mm
Focal Plane X Size              : 23.22mm
Focal Plane Y Size              : 15.49mm
ISO                             : 100
Target Aperture                 : 9
[b]Target Exposure Time            : 1/202[/b]
Exposure Compensation           : -2/3
White Balance                   : Auto
Slow Shutter                    : None
Shot Number In Continuous Burst : 0
Flash Guide Number              : 0
Flash Exposure Compensation     : 0
Auto Exposure Bracketing        : Off
AEB Bracket Value               : 0
Focus Distance Upper            : 0
Focus Distance Lower            : 0
F Number                        : 9
[b]Exposure Time                   : 1/215[/b]
Bulb Duration                   : 0
Auto Rotate                     : Rotate 270 CW
Self-timer 2                    : 0
Bracket Mode                    : Off
Bracket Value                   : 0
Bracket Shot Number             : 0
Macro Mode                      : Unknown (0)
Self-timer                      : 0
Image Quality                   : RAW
Canon Flash Mode                : Off
Continuous Drive                : Single
Focus Mode                      : Manual Focus
Canon Image Size                : Large
Easy Mode                       : Manual
Digital Zoom                    : Unknown (-1)
Contrast                        : +1
Saturation                      : +1
Sharpness                       : +1
Camera ISO                      : Use shot ISO instead
Metering Mode                   : Evaluative
Focus Range                     : Not Known
Canon Exposure Mode             : Aperture-Priority AE
Lens Type                       : Unknown (-1)
Long Focal                      : 50
Short Focal                     : 50
Focal Units                     : 1
Max Aperture                    : 1.8
Min Aperture                    : 22
Flash Activity                  : 0
Flash Bits                      : (none)
Zoom Source Width               : 3072
Zoom Target Width               : 3072
Color Tone                      : Normal
Canon Model ID                  : EOS Digital Rebel / 300D / Kiss Digital
Sensor Width                    : 3152
Sensor Height                   : 2068
Sensor Left Border              : 72
Sensor Top Border               : 16
Sensor Right Border             : 3143
Sensor Bottom Border            : 2063
Decoder Table                   : 1 0 514 4510557
Canon Image Width               : 3072
Canon Image Height              : 2048
Canon Image Width As Shot       : 3072
Canon Image Height As Shot      : 2048
AF Points Used                  : (none)
Color Temperature               : 5200
WB RGGB Levels Auto             : 1996 829 834 910
WB RGGB Levels Daylight         : 1844 829 834 970
WB RGGB Levels Shade            : 2174 829 834 823
WB RGGB Levels Cloudy           : 2010 829 834 886
WB RGGB Levels Tungsten         : 1387 956 961 1718
WB RGGB Levels Fluorescent      : 1593 832 837 1334
WB RGGB Levels Flash            : 2073 829 834 878
WB RGGB Levels Custom           : 1844 829 834 970
WB RGGB Levels Kelvin           : 1841 829 834 970
Color Space                     : sRGB
Raw Jpg Quality                 : Normal
Raw Jpg Size                    : Small
Raw Jpg Width                   : 1536
Raw Jpg Height                  : 1024
Serial Number Format            : Format 1
Aperture                        : 9.0
Drive Mode                      : Single-frame shooting
Flash                           : Off
Image Size                      : 3072x2048
Lens                            : 50.0mm
Scale Factor To 35mm Equivalent : 1.6
Shooting Mode                   : Aperture-Priority AE
[b]Shutter Speed                   : 1/215[/b]
WB RGGB Levels                  : 1996 829 834 910
Blue Balance                    : 1.094408
Circle Of Confusion             : 0.019 mm
Focal Length                    : 50.0mm (35mm equivalent: 77.5mm)
Hyperfocal Distance             : 14.36 m
Lens                            : 50.0mm (35mm equivalent: 77.5mm)
Red Balance                     : 2.400481
 
En till:

Källkod:
ExifTool Version Number         : 6.13
File Name                       : crw_1923.crw
File Size                       : 6 MB
File Modification Date/Time     : 2006:04:23 13:43:36
File Type                       : CRW
MIME Type                       : image/x-raw
Raw Data                        : (Binary data 6139680 bytes, use -b option to extract)
Jpg From Raw                    : (Binary data 425888 bytes, use -b option to extract)
File Format                     : CRW
Target Compression Ratio        : 10
Image Width                     : 3072
Image Height                    : 2048
Pixel Aspect Ratio              : 1
Rotation                        : 270
Component Bit Depth             : 8
Color Bit Depth                 : 24
Color BW                        : 257
Target Image Type               : Real-world Subject
Record ID                       : 0
File Number                     : 419-1923
Date/Time Original              : 2006:04:23 13:43:16
Time Zone Code                  : 0
Time Zone Info                  : 0
Original File Name              : CRW_1923.CRW
Thumbnail File Name             : CRW_1923.THM
User Comment                    :
Measured EV                     : 8.625
Canon File Description          : EOS 300D DIGITAL CMOS RAW
Canon Image Type                : CRW:EOS 300D DIGITAL CMOS RAW
Owner's Name                    :
Make                            : Canon
Camera Model Name               : Canon EOS 300D DIGITAL
Camera Body No.                 : 0470033766
Base ISO                        : 100
ROM Operation Mode              : USA
Canon Firmware Version          : Firmware Version 1.1.1
Focal Length                    : 50mm
Focal Plane X Size              : 23.22mm
Focal Plane Y Size              : 15.49mm
ISO                             : 100
Target Aperture                 : 9
[b]Target Exposure Time            : 1/251[/b]
Exposure Compensation           : -2/3
White Balance                   : Auto
Slow Shutter                    : None
Shot Number In Continuous Burst : 0
Flash Guide Number              : 0
Flash Exposure Compensation     : 0
Auto Exposure Bracketing        : Off
AEB Bracket Value               : 0
Focus Distance Upper            : 0
Focus Distance Lower            : 0
F Number                        : 9
[b]Exposure Time                   : 1/256[/b]
Bulb Duration                   : 0
Auto Rotate                     : Rotate 270 CW
Self-timer 2                    : 0
Bracket Mode                    : Off
Bracket Value                   : 0
Bracket Shot Number             : 0
Macro Mode                      : Unknown (0)
Self-timer                      : 0
Image Quality                   : RAW
Canon Flash Mode                : Off
Continuous Drive                : Single
Focus Mode                      : Manual Focus
Canon Image Size                : Large
Easy Mode                       : Manual
Digital Zoom                    : Unknown (-1)
Contrast                        : +1
Saturation                      : +1
Sharpness                       : +1
Camera ISO                      : Use shot ISO instead
Metering Mode                   : Evaluative
Focus Range                     : Not Known
Canon Exposure Mode             : Aperture-Priority AE
Lens Type                       : Unknown (-1)
Long Focal                      : 50
Short Focal                     : 50
Focal Units                     : 1
Max Aperture                    : 1.8
Min Aperture                    : 22
Flash Activity                  : 0
Flash Bits                      : (none)
Zoom Source Width               : 3072
Zoom Target Width               : 3072
Color Tone                      : Normal
Canon Model ID                  : EOS Digital Rebel / 300D / Kiss Digital
Sensor Width                    : 3152
Sensor Height                   : 2068
Sensor Left Border              : 72
Sensor Top Border               : 16
Sensor Right Border             : 3143
Sensor Bottom Border            : 2063
Decoder Table                   : 1 0 514 4510093
Canon Image Width               : 3072
Canon Image Height              : 2048
Canon Image Width As Shot       : 3072
Canon Image Height As Shot      : 2048
AF Points Used                  : Center
Color Temperature               : 5200
WB RGGB Levels Auto             : 1991 829 834 909
WB RGGB Levels Daylight         : 1844 829 834 970
WB RGGB Levels Shade            : 2174 829 834 823
WB RGGB Levels Cloudy           : 2010 829 834 886
WB RGGB Levels Tungsten         : 1387 956 961 1718
WB RGGB Levels Fluorescent      : 1593 832 837 1334
WB RGGB Levels Flash            : 2073 829 834 878
WB RGGB Levels Custom           : 1844 829 834 970
WB RGGB Levels Kelvin           : 1841 829 834 970
Color Space                     : sRGB
Raw Jpg Quality                 : Normal
Raw Jpg Size                    : Small
Raw Jpg Width                   : 1536
Raw Jpg Height                  : 1024
Serial Number Format            : Format 1
Aperture                        : 9.0
Drive Mode                      : Single-frame shooting
Flash                           : Off
Image Size                      : 3072x2048
Lens                            : 50.0mm
Scale Factor To 35mm Equivalent : 1.6
Shooting Mode                   : Aperture-Priority AE
[b]Shutter Speed                   : 1/256[/b]
WB RGGB Levels                  : 1991 829 834 909
Blue Balance                    : 1.093205
Circle Of Confusion             : 0.019 mm
Focal Length                    : 50.0mm (35mm equivalent: 77.5mm)
Hyperfocal Distance             : 14.36 m
Lens                            : 50.0mm (35mm equivalent: 77.5mm)
Red Balance                     : 2.394468
 
Exposure Compensation : -2/3

?

Ett värde är uppmätt och enligt kameran det korrekta värdet som skall användas. Ett annat är värdet som funkar med fraktionerna enligt exponeringen, och ett tredje är det verkligt exponerade.

Target Exposure Time: 1/251 ; uträknat
Exposure Time : 1/256 ; det kameran väljer

(tror jag, vet inte. låter hyfsat logiskt iaf)
 
Senast ändrad:
Det funderade jag lite på eftersom jag kompenserade ner lite, men på den andra bilden är de så lika de båda tiderna...
Kanske programmet som visar tokigt, den borde ju ge en jämn slutartid som 1/200 eller 1/250.
 
ANNONS
Götaplatsens Foto