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HomeAircraftHelicopterAerial Photography and Video › why are my photos not in focus?
11-06-2004 12:25 AM  13 years agoPost 1
DANNO

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St. Petersburg, Florida

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ok lately all my photos seem to be out of focus when blown up. not pixilated though. my question is if this is normal or should the pictures appear to get pixilated before they apear out of focus.

check this one out. i took this with a 7 mega pixel camera and cropped it, then "view image actual size". this is what it looks like. it apears blurry but not pixilated. the shutter speed is 1/1000. focus fixed at infinity.

http://www.skypixhelicam.com/doncesar.jpg


it seems that most of my photos are similar. im using a canon s70 powershot, and the same thing happens when taking shots by hand.
any adive is appreciated as always

www.skypiximaging.com

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11-06-2004 12:53 AM  13 years agoPost 2
bell-230

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sonoma, ca (currently milano italy)

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aperature perhaps????? but that wold be more of a color issua, just listing what comes to mind though! btw that s70 is one nice camera! could maye even just be fuel residue on the lense.... i use my sn glass cleaner whenever i get my lense dirty.

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11-06-2004 02:54 AM  13 years agoPost 3
fitenfyr

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Port Orchard, Washington

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How are you cropping the image?
If you are using photoshop and cropping from a larger image it will tend to make the image appear out of focus. It is the product of too much enlargement from the original. Basically you have asked the program to not only crop out the unwanted stuff, but then enlarge the image to the same size.
Try re-sizing the image first to a smaller size then cropping and see how it looks.
Remember Pixels are not everything when it comes to digital. The piece of glass (or plastic. ) in front of the CCD has more to do with the overall image than the size of the CCD (the pixels)

Post the uncropped original and we can get a better feel for the problem.

Jason Stiffey
Fly Fast....Live Slow...

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11-06-2004 03:06 AM  13 years agoPost 4
ericslife

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vancouver b.c. Canada

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How old is the camera. It could be a warrenty problem.Colour is ok and at that shutter speed we shouldent see much.Some canons have a focussing problem, but usally when in auto.??

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11-06-2004 07:53 AM  13 years agoPost 5
Crusty Commie

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Wales

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I am not familiar with that camera, but have you gone through the mode settings?, it looks a lot like a soft focus mode used for portraits and stuff

I am dsylexia of borg..resistance is fruity...your arse will be laminated

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11-06-2004 11:02 PM  13 years agoPost 6
DANNO

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St. Petersburg, Florida

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ok here is the original photo...

http://www.skypixhelicam.com/IMG_1065.JPG

as you can see i cropped out most of the picture to get the hotel. its a pretty new camera. the settings are on auto, but the shutter speed was 1/1000 and im assuming the focus was at infinity.

the photo i first posted was cropped and "viewed at actual size" according to my photo editor. it just lookes blurry to me, but maybe thats normal?

so is the original here out of focus or is this just what happens when you "veiw at actual size"?

much appreciated!

danno

www.skypiximaging.com

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11-07-2004 12:55 AM  13 years agoPost 7
Clicky finger

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Christchurch, New Zealand

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Danno

I agree, the full-sized image doesn't quite look 100%. I would have suggested it may be a function of the 'aerobatics' you were executing at the time of exposure , but if you think you are getting similar results when using the camera hand held, it has to be a function of the camera and nothing to do with 'platform' issues.

If the camera was on 'auto' that could be where the problem is. I'm sure you have a shutter priority setting on your camera. Try using it with the shutter speed set to either 1/500, or 1/1000th to be sure. And make sure too, that the ISO setting is high enough under the shooting conditions so that aperture issues AREN'T issues.

If the camera is on 'auto,' it possibly means auto focus too. If you can set the camera onto manual focus and focus it to infinity, you can be sure it isn't a focusing issue. The camera I'm using has a 'My Mode' setting in which you can set every parameter desired so that the camera is immediately on the correct settings with the single mode selection. Which I'd done. Clever I thought. But I too was having a struggle with photos that weren't sharp. It wasn't until after I'd done a couple of jobs with it, I discovered that although the focus was set to manual in this mode, it was focusing at 2.5 meters! Quickly rectified.

Manual focus of course means the camera doesn't have to think about or set distance and on many cameras will decrease the delay between triggering the camera and it actually taking the photograph.

Lets know how you go.

Pete

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11-07-2004 03:37 AM  13 years agoPost 8
llamatrails

rrApprentice

Gainesville GA - USA

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Here is the EXIF data for your http://www.skypixhelicam.com/IMG_1065.JPG image that is out of focus :

Make - Canon
Model - Canon PowerShot S70
Orientation - Top left
XResolution - 180
YResolution - 180
ResolutionUnit - Inch
DateTime - 2004:11:03 17:04:57
YCbCrPositioning - Centered
ExifOffset - 196
ExposureTime - 1/1000 seconds
FNumber - 3.50
ExifVersion - 0220
DateTimeOriginal - 2004:11:03 17:04:57
DateTimeDigitized - 2004:11:03 17:04:57
ComponentsConfiguration - YCbCr
CompressedBitsPerPixel - 3 (bits/pixel)
ShutterSpeedValue - 1/1002 seconds
ApertureValue - F 3.51
ExposureBiasValue - 0.00
MaxApertureValue - F 2.80
MeteringMode - Center weighted average
Flash - Not fired, compulsory flash mode
FocalLength - 5.81 mm
UserComment -
FlashPixVersion - 0100
ColorSpace - sRGB
ExifImageWidth - 3072
ExifImageHeight - 2304
InteroperabilityOffset - 1870
FocalPlaneXResolution - 10816.90
FocalPlaneYResolution - 10816.90
FocalPlaneResolutionUnit - Inch
SensingMethod - One-chip color area sensor
FileSource - DSC - Digital still camera
CustomRendered - Normal process
ExposureMode - Auto
WhiteBalance - Auto
DigitalZoomRatio - 1.00 x
SceneCaptureType - Standard

Maker Note (Vendor): -
Macro mode - Normal
Self timer - Off
Quality - Fine
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 - 50
Metering mode - Center weighted
Focus type - Auto
AF point selected -
Exposure mode - Program
Focal length - 186 - 662 mm
Flash activity -
Sequence number - 0
White Balance - Auto
Image Type - IMG:PowerShot S70 JPEG
Firmware Version - Firmware Version 1.00
Image Number - 1101065
Owner Name - [

Note that in the second section, it says:
Focus type - Auto

Doesn't look like you were in Manual Focus mode and infinity.

Rick

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11-07-2004 04:39 AM  13 years agoPost 9
CKY

rrVeteran

Sunshine Coast, BC, Canada

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Just checked out DPreview site for s70..nice camera!!

It did mention the pictures come out a little "soft". You could set some in camera sharpening. Try boosting the ISO to 200, that should help with getting a smaller aperture at the wide angle setting which will give a bit more clarity to the edge portions of the pic while still maintaining the 1/100th of a second shutter.

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11-07-2004 05:05 AM  13 years agoPost 10
Clicky finger

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Christchurch, New Zealand

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llamatrails

Hey man!! Mighty impressive list of information relating to the photo in question. How'd you do dat???

Good spotting re the auto focus.

Pete

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11-07-2004 05:16 AM  13 years agoPost 11
CKY

rrVeteran

Sunshine Coast, BC, Canada

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Just finished experimenting with detail loss when rotating an image almost 10 degrees. Was not nearly as bad as I thought, but, was noticable. What was 2 pixels wide became almost 3 pixels wide after antialiasing (softening) took place. Different places on the pic were a little different. Try drawing some non-antialiased lines a couple pixels wide in photoshop then rotate. You will get the picture. Bad pun :-)

Plus cropping a 7 meg file that much you are getting the equivalent of a 2meg camera shot level. 8meg devided by 2, verticle and horizontal yield a 2meg camera.

Chris

PS..what the hell were you doing during the picture

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11-07-2004 05:51 AM  13 years agoPost 12
marked23

rrKey Veteran

Lynnwood, WA

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Here's my take on this.

It has to do with the rotation algorithm of the paint program you are using. It's easy for a computer to rotate an image 90 or 180 deg. It's quite a lot harder for it to rotate an image 18deg... which is what you did.

You will loose maybe 5% of the clairity of the image when rotating at an arbitrary angle. It shouldn't be a visible artifact, but your image was right on the edge of being visibly imperfect already... that 5% put it across the line and then you could tell.

You could use the "sharpen" tool in your paint program to attempt to get rid of this.

Another thing you could do is take the pictures in "raw" format. Raw is really a waste of space. I would prefer to see an option for IFF or TIFF. But raw is an option for you... give it a shot (pun). I was able to see some jpeg artifacts in your original image. At the very least, make sure you are on the highest quality jpeg setting.

One more thing... Digital cameras have this funky thing about not recording luminance except for on the green pixels... The other pixels are interpolated from the green pixel data. So yet another option for sharper images is to use a camera with that new-fangled 3-layer ccd that overcomes that limitation.

-Mark

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11-07-2004 02:38 PM  13 years agoPost 13
llamatrails

rrApprentice

Gainesville GA - USA

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re: EXIF data

The camera stores all of that information in the image. Most decent image manipulation programs/editors allow you to view the EXIF data.

I used Irfanview, http://www.irfanview.com

Here is their blurb :

What is IrfanView?

IrfanView is a very fast, small, compact and innovative FREEWARE (for non-commercial use) graphic viewer for Windows 9x/ME/NT/2000/XP/2003.

It is trying to be simple for beginners and powerful for professionals.

IrfanView was the first Windows graphic viewer WORLDWIDE with Multiple (animated) GIF support.
One of the first graphic viewers WORLDWIDE with Multipage TIF support.
The first graphic viewer WORLDWIDE with Multiple ICO support.

Some IrfanView features:
* Many supported file formats (click here the list of formats)
* Multi language support
* Thumbnail/preview option
* Slideshow (save slideshow as EXE/SCR or burn it to CD)
* Show EXIF/IPTC/Comment text in Slideshow/Fullscreen etc.
* Support for Adobe Photoshop Filters
* Drag & drop support
* Fast directory view (moving through directory)
* Batch conversion (with image processing)
* Multipage TIF editing
* Email option
* Multimedia player
* Print option
* Change color depth
* Scan (batch scan) support
* Cut/crop
* IPTC editing
* Effects (Sharpen, Blur, Adobe 8BF, Filter Factory, Filters Unlimited, etc.)
* Capturing
* Extract icons from EXE/DLL/ICLs
* Lossless JPG rotation
* Many hotkeys
* Many command line options
* Many PlugIns
* Only one EXE-File, no DLLs, no Shareware messages like "I Agree" or "Evaluation expired"
* No registry changes without user action/permission!
* and many more

Nope, I don't get anything from these guys, just find their program very useful for viewing images.

Rick

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11-07-2004 06:37 PM  13 years agoPost 14
DANNO

rrKey Veteran

St. Petersburg, Florida

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raw vs jpeg
ok excuse my ignorance here.....

i went out and did some test shots trying to figure this out. i took photos in superfine jpg and in raw. the image editor i have converts the raw to tiff after downloading....

so i couldnt tell any differnece in the focus or sharpness between the 2. is this usually the case. is shooting in raw format only for when you need to manipulate the image? and if so, what can you do in raw format that you cant do in jpeg?

thanks

www.skypiximaging.com

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11-07-2004 08:08 PM  13 years agoPost 15
Spitfire_mk5

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Canada

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jpeg is lossy. RAW TIF ect. are lossless along with RAW giving you direct data from the camera without any pre-manipulation. (also some RAW formats actually have larger color space (24 / 32 bit))

Have a look at a histogram of a TIF/RAW and a jpg of the same shot...

Also JPG has trouble with fine detail (theres that lossy algorythm again) such as textures. Not to mention what would happen if you resaved both the JPG and the TIF version 10 times...

Check out http://www.wotsits.org for everything you ever didn't want to know about jpeg TIF (and a tiny bit about RAW)

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11-07-2004 08:22 PM  13 years agoPost 16
CKY

rrVeteran

Sunshine Coast, BC, Canada

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From what I understand RAW format is the original data from the CCD. Stored in either 12 or 14 bits per color. The camera algorithims then apply white balance, color temp, in camera sharpening, color management etc. THEN convert down to 8 bits per color and store on your flashcard as TIFF (lossless) or JPG (lossy)

Even Tiff is inferior to Raw, but, most photo editing software cannot read the RAW data. That is changing with the higher end packages.

If you have the ability to work with the RAW data you can control how the final photo is rendered manually rather than preset camara algorithms. Down side is most cameras that store RAW data take a very long time to save to the card. Newer cameras like the the D70 have a feature that saves both Raw AND standard compression Jpg to the card at the same time. True digital negative for you and usuable JPG for the customer.

Dealing with Raw data is another steep learning curve that may have to be learned?? Does it ever stop???

Chris

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11-07-2004 08:59 PM  13 years agoPost 17
bill the greek

rrKey Veteran

Greece

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danno,
do you check to take foto on the ground?
not from the heli.
the problem is the same?

Vasilis

Nobody is Perfect but who want to be Nobody...

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