2 Dinos EXIF

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Dudley Hanks - 19 May 2008 04:04 GMT

Greetings Folks,

Just a quick note about the EXIF info of the full-size dinosaur image on my
site:

http://www.photography.dudley-hanks.com/Light-And-Sight/index.html

I can't seem to figure out how to make the EXIF info available on-line, but,
if you download the photo and use Windows Explorer to look at the file
properties, the data is there.

For those of you who are interested, I hope this helps.

Also, I've received about a half dozen entries to the digital challenge.
I'm hoping to get at least double that number. So, if anyone else is daring
enough to tackle the D3's and the Mark IIIs with a cellphone, FinePix or
Lumex, send your entry to:

photos.digital@dudley-hanks.com

Or, if you have one of the big-buck brutes and want to settle this issue
once and for all, I look forward to posting your pic. (But, I'm gonna down
size it a bit first...)

Take Care,
Dudley

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Paul Furman - 19 May 2008 07:50 GMT

> Greetings Folks,
>
[quoted text clipped - 4 lines]
>
> I can't seem to figure out how to make the EXIF info available on-line,

edited highlights:
---------------------------------------------------------------
Model - Canon PowerShot A720 IS
ExposureTime - 1/1.7 seconds
ShutterSpeedValue - 1/2 seconds
ApertureValue - F 4.00
ExposureBiasValue - -0.67
MaxApertureValue - F 3.19
FocalLength - 9.95 mm
ExifImageWidth - 3264
ExifImageHeight - 2448
ExposureMode - Manual
Quality - Superfine
Easy shooting mode - Manual
ISO Value - 100
Exposure mode - Av-priority
Focal length - 5800 - 34800 mm (1000 mm)
Subject Distance - 241
Image Number - 1001949

full version as copied from irfanview:
---------------------------------------------------------------
File: - C:\Users\paul\Desktop\two-dinos.jpg

Make - Canon
Model - Canon PowerShot A720 IS
Orientation - Top left
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
DateTime - 2008:05:17 12:57:19
YCbCrPositioning - Centered
ExifOffset - 196
ExposureTime - 1/1.7 seconds
FNumber - 4.00
ISOSpeedRatings - 100
ExifVersion - 0220
DateTimeOriginal - 2008:05:17 12:57:19
DateTimeDigitized - 2008:05:17 12:57:19
ComponentsConfiguration - YCbCr
CompressedBitsPerPixel - 5 (bits/pixel)
ShutterSpeedValue - 1/2 seconds
ApertureValue - F 4.00
ExposureBiasValue - -0.67
MaxApertureValue - F 3.19
MeteringMode - Multi-segment
Flash - Not fired, compulsory flash mode
FocalLength - 9.95 mm
UserComment -
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 3264
ExifImageHeight - 2448
InteroperabilityOffset - 3362
FocalPlaneXResolution - 14506.67
FocalPlaneYResolution - 14485.21
FocalPlaneResolutionUnit - Inch
SensingMethod - One-chip color area sensor
FileSource - DSC - Digital still camera
CustomRendered - Normal process
ExposureMode - Manual
White Balance - Auto
DigitalZoomRatio - 1.00 x
SceneCaptureType - Standard

Maker Note (Vendor): -
Macro mode - Normal
Self timer - Off
Quality - Superfine
Flash mode - Not fired
Sequence mode - Single or Timer
Focus mode - Single
Image size - Large
Easy shooting mode - Manual
Digital zoom - None
Contrast - Normal
Saturation - Normal
Sharpness - Normal
ISO Value - 100
Metering mode - Evaluative
Focus type - Auto
AF point selected -
Exposure mode - Av-priority
Focal length - 5800 - 34800 mm (1000 mm)
Flash activity -
Flash details -
Focus mode 2 - Single
White Balance - Auto
Sequence number - 0
Flash bias - 0.00 EV
Subject Distance - 241
Image Type - IMG:PowerShot A720 IS JPEG
Firmware Version - Firmware Version 1.00
Image Number - 1001949
Owner Name -

Thumbnail: -
Compression - 6 (JPG)
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
JpegIFOffset - 5108
JpegIFByteCount - 5471

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Dudley Hanks - 19 May 2008 08:45 GMT

>> Greetings Folks,
>>
[quoted text clipped - 108 lines]
> JpegIFOffset - 5108
> JpegIFByteCount - 5471

Thanks, Paul, I appreciate your making that info available. Now, I just
have to figure out how to do that myself. Also, I need to figure out how to
read some of those stats.

Regarding shutter speed, the info says:

> ExposureTime - 1/1.7 seconds
> ShutterSpeedValue - 1/2 seconds
> ExposureBiasValue - -0.67

Does anyone have a quick explanation of what this all means, and how it
relates to 0.6 seconds which is what I get when I go into the Properties
dialog box?

Take Care,
Dudley

Reply to this Message

Paul Furman - 19 May 2008 19:56 GMT

> "Paul Furman" <paul-@-edgehill.net> wrote in message
>
> Thanks, Paul, I appreciate your making that info available. Now, I just
> have to figure out how to do that myself.

In irfanview, type I then E and copy to clipboard. Irfan is not perfect
though, just easy but sometimes misses little bits. I also use exiftool
with a batch file to grab & format the data I want from a folder full of
images into little text files my web site can use to present the info:

extract-exif-from JPG-to-txt.bat
---------------------------------------
for %%I in (*.JPG) do (
c:\exiftool\exiftool.exe -f -q -p c:\exiftool\format.txt %%I >
%%~nI.exif.txt
)

format.txt
---------------------------------------
$model $focallength f/$Aperture ${ShutterSpeed}s
ISO:$EXIF:ISO EC:$ExposureCompensation
lens:$Lens $LensType $Flash

> Also, I need to figure out how to
> read some of those stats.
[quoted text clipped - 7 lines]
> relates to 0.6 seconds which is what I get when I go into the Properties
> dialog box?

That confused me too. 0.6 seconds is about a half a second and so is
1/1.7 and 6/10 are the same.

ExposureBiasValue sounds like exposure compensation to me, like you
wanted a darker image & chose -0.67 stop darker.

Signature

Paul Furman
www.edgehill.net
www.baynatives.com

all google groups messages filtered due to spam

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Dudley Hanks - 19 May 2008 20:55 GMT

>> "Paul Furman" <paul-@-edgehill.net> wrote in message Thanks, Paul, I
>> appreciate your making that info available. Now, I just have to figure
[quoted text clipped - 17 lines]
> EC:$ExposureCompensation
> lens:$Lens $LensType $Flash

Now, that looks useful. I'll give it a try. Batch files are something I
can use without too much difficulty.

Thanks, Paul.

>> Also, I need to figure out how to read some of those stats.
>>
[quoted text clipped - 9 lines]
> That confused me too. 0.6 seconds is about a half a second and so is 1/1.7
> and 6/10 are the same.

Yeah, 1/1.7 will give an approximate of 0.6 second for the exposure time,
but, it's an awfully awkward way to present that info if that's what is
intended. The shutter speed of 1/2 a second also makes sense. But, I would
tend to think that Microsoft Explorer should be able to pick that up fairly
easily, if that is the correct value.

Either bit of data can be presented as the "shutter speed," but why both
together with slightly different slices of time?

I guess I'll have to look into that a bit deeper.

> ExposureBiasValue sounds like exposure compensation to me, like you wanted
> a darker image & chose -0.67 stop darker.

Now, you've got that one nailed, Paul. I did use a -2/3 stop exposure
compensation. I used to use -1/3 until Jeff and Vance told me the
highlights in my picture of Dima were still blown a bit. So, I moved that
down to -2/3, and I'm keeping an ear alert for feedback on whether that is
working. So far, nobody has said anything about blown highlights or muddy
shadows, so I think that is pretty good for most situations.

Once again, Paul, thanks for spending some time helping me to clear up one
of these quirky digital things.

Take Care,
Dudley

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Paul Furman - 19 May 2008 21:55 GMT

> Paul Furman wrote
>>
[quoted text clipped - 15 lines]
> Either bit of data can be presented as the "shutter speed," but why both
> together with slightly different slices of time?

I don't know, there is so much junk in exif data. If I was choosing, I'd
pick 1/1.7 because that's the way my camera presents it, even though
that particular one is funky looking.

> I guess I'll have to look into that a bit deeper.

Signature

Paul Furman
www.edgehill.net
www.baynatives.com

all google groups messages filtered due to spam

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The One - 20 May 2008 12:13 GMT

> Greetings Folks,
>
[quoted text clipped - 22 lines]
> Take Care,
> Dudley

There are a few blind photographers out there, funnily enough they are
better than some with perfect vision trying to flog stuff.

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Dudley Hanks - 20 May 2008 15:26 GMT

> There are a few blind photographers out there, funnily enough they are
> better than some with perfect vision trying to flog stuff.

Yeah, there are a few of us tripping around the net.

I thought I was a strange case. Then I came across an article about a blind
photographer with the same visual condition I have. He claims to be able to
have x-ray vision.

http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2005/02/27/PKG5QBEBB01.DTL&type
=printable

I wish my eyes worked like that.

Take Care,
Dudley

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Allen - 20 May 2008 20:22 GMT

>> There are a few blind photographers out there, funnily enough they are
>> better than some with perfect vision trying to flog stuff.
[quoted text clipped - 11 lines]
> Take Care,
> Dudley

Dudley, I read the story at the link. Very interesting person indeed, as
apparently you are also. This all has reminded me of the American
History teacher I had in high school 65 years ago. One eye apparently
didn't develop properly in the womb and was totally useless, small,
shriveled and opaque. He had a small amount of vision, poor enough to be
declared legally blind, in the other eye, but he had a muscular problem
that caused that eye to be constantly rolling, totally out of control.
He was the best teacher I had in high school. The San Francisco story
mentioned "eyes in the back of his head", which some of the cutups and
troublemakers in his classes came to believe he had. On the first day of
classes he learned where every student sat and any time he heard the
slightest disturbance he would whirl around, point at the culprit and
"John, go to the principals office--now!" or "Sam, no more of that.
Understand?" He walked around the campus taking 36 inch strides, faster
than any of the students walked, without even a cane. I had him when I
was a sophomore and the next two years I read to him once a week,
reading tests to be graded, current event assignments, occasionally
something like "get such and such book and read the second paragraph on
page whatever". There are some people who just feel sorry for themselves
about handicaps, but some just figure out ways to do what they want to
do; it is very rewarding to have known at least one of the latter type.
Allen

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Dudley Hanks - 20 May 2008 21:32 GMT

>>> There are a few blind photographers out there, funnily enough they are
>>> better than some with perfect vision trying to flog stuff.
[quoted text clipped - 33 lines]
> one of the latter type.
> Allen

Actually, I know what the guy is talking about when he says he has "x-ray"
vision.

In the early stages of retinitis pigmentosa, RP, the eye becomes sensitive
to minute gradations in colour, especially in the lower frequencies. Or, at
least mine did. When I would hold my hand up to the light, it would appear
very much like what most people imagine when thinking about an x-ray.

I went through this stage having the benefit of years studying photography,
so I had a fairly good knowledge of light and its affects. Hence, I
attributed the strange appearance of my hand to an exagerated appreciation
of the light waves wrapping around my fingers. The skin would take on a
reddish hue as I moved my gaze from the outer edges into the middle of an
area, with the center appearing quite dark in comparison to the fringes.
Like I said, a very skeleton-like image appeared, and it wouldn't take a
huge leap in imagination to think that one had x-ray vision -- especially
when the individual in question is becoming aware of the onset of the
pending loss of vision. The mind tends to grasp for straws in these
situations.

Like you mentioned, some people cope with it, some don't. As strange as
this fellow's story is, at least he is making a positive contribution to the
world around him, as did the fellow you knew.

Take Care,
Dudley

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