Itay747 From Israel, joined Aug 2012, 27 posts, RR: 0 Posted (3 months 4 days ago) and read 1363 times:
Hello,
I have recently bought the Canon 7D (feat. ef 70-200 2.8)
After I had uploaded the photos to my computer, I saw every photo with a plane in the middle and blue sky as the backgorund is 3-4 mega. So, after a bit of editing, the result was 250-350 kilobyte. Every photo is compressed and I don't know why. I save my images on the highest quality (12 on CS5) and on my 7D I shoot on the highest quality of JPEG.
All my photos are very compressed and a lot of details are missing.
dazbo5 From United Kingdom, joined Mar 2005, 2572 posts, RR: 2 Reply 1, posted (3 months 3 days 23 hours ago) and read 1339 times:
Itay,
As I commented on your other topic, I think you need to post an example so we can take a look and comment. It's difficult to give advice without knowing where you are going wrong.
Quoting Itay747 (Thread starter): I have recently bought the Canon 7D (feat. ef 70-200 2.8)
That's a good camera and lens. However, you need to know how to use it and get the best from it. Expensive and good quality equipment is nice, but you need to understand the basics of photography too.
Quoting Itay747 (Thread starter): I saw every photo with a plane in the middle and blue sky as the backgorund is 3-4 mega.
Does this mean you are heavily cropping the photos from an 18 mega pixel original to 3-4 mega pixels? That right there may be your problem.
Quoting Itay747 (Thread starter): All my photos are very compressed and a lot of details are missing.
If you are heavily cropping them, there's no surprise this is what you're getting.
Darren
Equipment: 2x Canon EOS 50D; Sigma 10-20 EX DC HSM, 50-500 EX APO DG, Canon 24-105 f/4 L, Speedlite 430EX
jpmagero From United States of America, joined Apr 2012, 149 posts, RR: 0 Reply 2, posted (3 months 3 days 22 hours ago) and read 1322 times:
Quoting Itay747 (Thread starter): I saw every photo with a plane in the middle and blue sky as the background is 3-4 mega
My experience is that jpeg photos at full resolution and moderate detail come out closer to 6-7 MBs. Are you using the "Large/Fine" setting? Seems like it might be "Medium" instead.
Itay747 From Israel, joined Aug 2012, 27 posts, RR: 0 Reply 3, posted (3 months 3 days 21 hours ago) and read 1307 times:
Quoting dazbo5 (Reply 1): That's a good camera and lens. However, you need to know how to use it and get the best from it. Expensive and good quality equipment is nice, but you need to understand the basics of photography too.
I do know how put settings on my equipment. I have been photographing for 3 years now.
Quoting dazbo5 (Reply 1): Does this mean you are heavily cropping the photos from an 18 mega pixel original to 3-4 mega pixels? That right there may be your problem.
I don't crop the photo, the original file is 3-4 mega. For example, a photo I took of a ramp where there are a lot of details like the plane in the gate and the runways, was 7 mega. If there is a plane and sky only it's 3-4 mega max.
I can't upload photos since I am not a premium member and not First.
I shoot on the highest Jpeg quality (L 18Megapixales).
Also, I put on daylight the center-weighted average Metering mode with 9 middle AF points. Is that ok? Could it affect the Jpeg comression problem?
dlowwa From Canada, joined Apr 2005, 7238 posts, RR: 32 Reply 4, posted (3 months 3 days 20 hours ago) and read 1289 times:
AIRLINERS.NET CREW HEAD SCREENER
Quoting Itay747 (Reply 3): I can't upload photos since I am not a premium member and not First.
You don't need to be a premium member to post photos, only to have them hosted by a.net. You can use an external hosting site, or just post the images directly.
I don't see any rejections for compression in the log, though quite a few for contrast. Some examples for everyone to see:
It looks to me that the problem may be poor editing combined with poor shooting conditions. The camera settings don't look to be a major issue unless you are doing something like shooting with the aperture stopped down significantly.
dazbo5 From United Kingdom, joined Mar 2005, 2572 posts, RR: 2 Reply 6, posted (3 months 3 days 20 hours ago) and read 1279 times:
Quoting Itay747 (Reply 3): the plane in the gate and the runways, was 7 mega. If there is a plane and sky only it's 3-4 mega max.
I see what you mean now, you mean the file size? The size of the file depends on the details in the photo. A file where there is little in the background will compress easier than one with detail like a ramp shot. The shot with less detail will therefore be a smaller file than one with lots of details, it's normal when shooting in jpeg and doesn't really make a lot of difference as long as you're using the full resolution and highest quality setting, ie least compression.
Looking at the photos that Dana kindly posted for you, the basics seem to be there, you just need to develop your workflow for submitting them for here. Have you read the editing guide for the site? That'll point you in the right direction as the ones above lack contrast but aren't too bad otherwise.
Quoting Itay747 (Reply 3): Also, I put on daylight the center-weighted average Metering mode with 9 middle AF points
Everone is different, but i'd use evaluative metering and not centre-weighted as aircraft aren't the easiest subject to get an accurate reading for with centre-weighting and will often give underexpose depending on the lighting on the aircraft. I would also use centre spot focussing rather than all 9 so you can choose where your focal point is and not the camera. This will help even out the depth of field across the frame and aircraft as the camera will often choose the closest part of the aircraft often resulting in the aft being out of focus. It's what works for you though.
Darren
Equipment: 2x Canon EOS 50D; Sigma 10-20 EX DC HSM, 50-500 EX APO DG, Canon 24-105 f/4 L, Speedlite 430EX
erikgrinsvall From Sweden, joined Jul 2008, 25 posts, RR: 0 Reply 7, posted (3 months 3 days 19 hours ago) and read 1262 times:
I sort of had the same problem, but then i just changed from AF SERVO to AF FOCUS (if you use AF) and it changed like night and day. However, on a 50D that is.
Like Dana said, the conditions don't look too promising.
vikkyvik From United States of America, joined Jul 2003, 8200 posts, RR: 28 Reply 8, posted (3 months 3 days 18 hours ago) and read 1257 times:
AIRLINERS.NET CREW PHOTO SCREENER
Quoting erikgrinsvall (Reply 7): I sort of had the same problem, but then i just changed from AF SERVO to AF FOCUS (if you use AF) and it changed like night and day. However, on a 50D that is
Changing AF mode shouldn't have anything to do with a file being more or less compressed....
"Two and a Half Men" was filmed in front of a live ostrich.
ckw From UK - England, joined Aug 2010, 529 posts, RR: 18 Reply 10, posted (3 months 3 days 12 hours ago) and read 1197 times:
The numbers for the output files sound reasonable (7mb with detail background 3-4 for blue sky) so I don't think the problem is with the camera or its settings.
The problem must be in your post processing - a 3/4 mb file becomes 350K
Exactly how do you process the file? (step by step please), esp. how you save, as there is more than one method in PS.
Unless ... is it possible you are saving both a large RAW and a small jpg (possible with the 7D) and somehow picking working on the jpg?
Itay747 From Israel, joined Aug 2012, 27 posts, RR: 0 Reply 11, posted (3 months 1 day 17 hours ago) and read 1069 times:
Quoting mjgbtv (Reply 5): What aspect ratio is your camera set to?
3:2. That's how I crop and take photos.
Quoting dazbo5 (Reply 6): Looking at the photos that Dana kindly posted for you, the basics seem to be there, you just need to develop your workflow for submitting them for here. Have you read the editing guide for the site? That'll point you in the right direction as the ones above lack contrast but aren't too bad otherwise.
I have seen A.net suggestion for editing, not bad but for contrast for instance I use the "Brightnes/Contrast" tool.
I may have a problem in choosing the ratio of contrast~brighness.
Quoting dazbo5 (Reply 6): Everone is different, but i'd use evaluative metering and not centre-weighted as aircraft aren't the easiest subject to get an accurate reading for with centre-weighting and will often give underexpose depending on the lighting on the aircraft. I would also use centre spot focussing rather than all 9 so you can choose where your focal point is and not the camera. This will help even out the depth of field across the frame and aircraft as the camera will often choose the closest part of the aircraft often resulting in the aft being out of focus. It's what works for you though.
You mean to choose Manual select.:Single point AF with the middle point?
Quoting ckw (Reply 10): Exactly how do you process the file? (step by step please), esp. how you save, as there is more than one method in PS.
Crop, Brightness~Contrast (usually a bit more brightness than contrast), levels (if nedded), Equalize (for checking dust points), then noise reduce (I used to use a patch for PS called "Noise Ninja" that reduces massivly the noise but also makes it abit soft and compressed. I have started using the PS noise reduction. On the noise reduction I put the following parameters: -Preview- check
- Basic and not advanced
- Settings- default
-Strength- mainly 5%, but 6% if there is a massive noise)
-Preserve Details- 60%
-Reduce color noise- 45%
-Sharpen details- 30%
-Remoce Jpeg artifect - not checked
Image size - 1024X683/1200/800:
Scale styles - checked
Constrain proprotions - checked
Resmaple image - checked
Bicubic(best for smooth gradientes)
Sharpenning if needed (I use the smart sharpen tool)
Saving by left left shift+leftCtrl+S (save as a copy on Jpeg format, ICC profile checked, use lower case extension. Done.
ckw From UK - England, joined Aug 2010, 529 posts, RR: 18 Reply 12, posted (3 months 1 day 15 hours ago) and read 1047 times:
I'm afraid I'm stumped. I've followed your steps as closely as possible and even at 1024 px, I still end up with images of around 1mb. However, mine is a different version of Noise Ninja, so I can't set the options exactly as you have.
All I can suggest is take a test image and then after each step (including before any editing) resize and save it. This should tell you exactly what step in the process is introducing the compression.
eskillawl From Sweden, joined Jan 2012, 73 posts, RR: 0 Reply 13, posted (3 months 20 hours ago) and read 960 times:
Quoting ckw (Reply 12): I have seen A.net suggestion for editing, not bad but for contrast for instance I use the "Brightnes/Contrast" tool.
Itay, try to use the auto contrast tool. I know alot of auto-tools is really bad, but the contrast is great and I dont get contrast rejections very often when using it.
Cheers Eskil.
Photo equipment: Canon EOS 60D | Canon 70-300 1:4-5:6 IS USM | Canon 28-90 1:4-5:6 | Canon 18-55 3:5-5:6 |
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