Tiro monedas al aire, pero hasta ahora nunca las pude agarrar.

Las fotografiás contienen metadatos que nos pueden servir de muchas maneras. Para poder visualizar de una manera en Debian Squeeze debemos de seguir algunos pasos muy sencillos.

OBS:

  • Ser root.

Entramos a la consola y escribimos:
aptitude install libimage-exiftool-perl

Una vez instalado la herramienta, volvemos a escribir en la consola:
exiftool -all /home/proyectosbeta/Desktop/IMG_3053.JPG

Sale por pantalla:
ExifTool Version Number : 8.15
File Name : IMG_3053.JPG
Directory : /home/proyectosbeta/Desktop
File Size : 3.4 MB
File Modification Date/Time : 2012:12:31 20:40:24-03:00
File Permissions : rw-r--r--
File Type : JPEG
MIME Type : image/jpeg
Exif Byte Order : Little-endian (Intel, II)
Image Description :
Make : Canon
Camera Model Name : Canon PowerShot SX230 HS
Orientation : Horizontal (normal)
X Resolution : 180
Y Resolution : 180
Resolution Unit : inches
Modify Date : 2012:12:31 20:40:25
Y Cb Cr Positioning : Co-sited
Exposure Time : 1/60
F Number : 3.1
ISO : 800
Exif Version : 0230
Date/Time Original : 2012:12:31 20:40:25
Create Date : 2012:12:31 20:40:25
Components Configuration : Y, Cb, Cr, -
Compressed Bits Per Pixel : 3
Shutter Speed Value : 1/60
Aperture Value : 3.1
Max Aperture Value : 3.1
Flash : Auto, Fired, Red-eye reduction
Focal Length : 5.0 mm
Macro Mode : Normal
Self Timer : Off
Quality : Fine
Canon Flash Mode : Red-eye reduction (Auto)
Continuous Drive : Single
Focus Mode : Single
Record Mode : JPEG
Canon Image Size : Large
Easy Mode : Unknown (36)
Digital Zoom : None
Contrast : Normal
Saturation : Normal
Sharpness : 0
Camera ISO : Auto High
Metering Mode : Evaluative
Focus Range : Auto
AF Point : Face Detect
Canon Exposure Mode : Easy
Lens Type : Unknown (-1)
Long Focal : 70 mm
Short Focal : 5 mm
Focal Units : 100/mm
Max Aperture : 3.1
Min Aperture : 8
Flash Bits : E-TTL, Built-in
Focus Continuous : Continuous
AE Setting : Normal AE
Image Stabilization : On
Display Aperture : 3.1
Zoom Source Width : 4000
Zoom Target Width : 4000
Spot Metering Mode : Center
Manual Flash Output : n/a
Auto ISO : 800
Base ISO : 100
Measured EV : 0.16
Target Aperture : 3.1
Target Exposure Time : 1/60
Exposure Compensation : 0
White Balance : Auto
Slow Shutter : Off
Shot Number In Continuous Burst : 0
Optical Zoom Code : 0
Flash Guide Number : 1.34375
Flash Exposure Compensation : 0
Auto Exposure Bracketing : Off
AEB Bracket Value : 0
Control Mode : Camera Local Control
Focus Distance Upper : 0.52
Focus Distance Lower : 0
Bulb Duration : 0
Camera Type : Compact
Auto Rotate : None
ND Filter : Off
Self Timer 2 : 0
Flash Output : 22
Canon Image Type : IMG:PowerShot SX230 HS JPEG
Canon Firmware Version : Firmware Version 1.01
File Number : 108-3053
Owner Name :
Canon Model ID : Unknown (0x3030000)
AF Area Mode : Multi-point AF or AI AF
Num AF Points : 9
Valid AF Points : 9
Canon Image Width : 4000
Canon Image Height : 3000
AF Image Width : 100
AF Image Height : 100
AF Area Widths : 18 18 18 18 18 18 18 18 18
AF Area Heights : 18 18 18 18 18 18 18 18 18
AF Area X Positions : -18 0 18 -18 0 18 -18 0 18
AF Area Y Positions : -18 -18 -18 0 0 0 18 18 18
AF Points In Focus : 1
Primary AF Point : 1
Thumbnail Image Valid Area : 0 0 0 0
Date Stamp Mode : Off
My Color Mode : Off
Firmware Revision : 1.01 rev 3.00
Categories : (none)
Image Unique ID : 6b336324a0e3732be9bb1c94fa3df93b
VRD Offset : 0
User Comment :
Flashpix Version : 0100
Color Space : sRGB
Exif Image Width : 4000
Exif Image Height : 3000
Interoperability Index : R98 - DCF basic file (sRGB)
Interoperability Version : 0100
Related Image Width : 4000
Related Image Height : 3000
Focal Plane X Resolution : 16393.44262
Focal Plane Y Resolution : 16393.44262
Focal Plane Resolution Unit : inches
Sensing Method : One-chip color area
File Source : Digital Camera
Custom Rendered : Normal
Exposure Mode : Auto
Digital Zoom Ratio : 1
Scene Capture Type : Standard
Compression : JPEG (old-style)
Thumbnail Offset : 5632
Thumbnail Length : 5859
Rating : 0
Image Width : 4000
Image Height : 3000
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:2 (2 1)
Aperture : 3.1
Flash Exposure Compensation : 0
Drive Mode : Single-frame shooting
Flash Type : Built-In Flash
Image Size : 4000x3000
Lens : 5.0 - 70.0 mm
Lens ID : Unknown 5-70mm
Red Eye Reduction : Off
Scale Factor To 35 mm Equivalent: 5.6
Shooting Mode : Unknown (36)
Shutter Curtain Sync : 1st-curtain sync
Shutter Speed : 1/60
Thumbnail Image : (Binary data 5859 bytes, use -b option to extract)
Circle Of Confusion : 0.005 mm
Field Of View : 65.6 deg
Focal Length : 5.0 mm (35 mm equivalent: 27.9 mm)
Hyperfocal Distance : 1.50 m
Lens : 5.0 - 70.0 mm (35 mm equivalent: 27.9 - 390.9 mm)
Light Value : 6.2

Como pueden darse cuenta, la información es demasiada larga.
Aveces repartimos fotografias por todas partes y no queremos proporcionar muchos datos, entonces para eliminar los metadatos de la fotografía, entramos a la consola y escribimos lo siguiente:
exiftool -all= /home/proyectosbeta/Desktop/IMG_3053.JPG

Sale esto por pantalla:
1 image files updated

Volvemos a escribir en la consola:
exiftool -all /home/proyectosbeta/Desktop/IMG_3053.JPG

Sale esto por pantalla:
ExifTool Version Number : 8.15
File Name : IMG_3053.JPG
Directory : /home/proyectosbeta/Desktop
File Size : 3.4 MB
File Modification Date/Time : 2013:02:16 18:38:00-03:00
File Permissions : rw-r--r--
File Type : JPEG
MIME Type : image/jpeg
Image Width : 4000
Image Height : 3000
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:2 (2 1)
Image Size : 4000x3000

Pueden darse cuenta, se eliminaron muchos datos. Ahora si ya podrán repartir sus fotografías sin problema. 🙂
Fuente: Cuaderno de Novato en Debian

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