I did not use any color-correction, I have looked at the color correction features, but honestly I haven't been able to figure out what they do, or when I would need to use them.
I somewhat embarassed to say I don't know if the lens vignettes or not, or how to tell. It was shot with a Cannon EF-S 55-250mm f4-5.6 IS lens at 214mm, ISO200, f6.3.

My setup? Mac OS/X 10.8.2 - Mac Pro - 2x Quad Core (16 CPU), 24GB RAM.... or were you asking about photo equipment setup?

Last edited by FlatBallFlyer (2013-03-01 16:56:40)

It is quite a common problem in panoram where large areas of the sky and the color correction and vignetting correction it does nothing to help. It's a big problem panoramas and developers autopano giga would be addressed

FlatBallFlyer wrote:

Klaus

Thank you for your patience.... wish I had more time to spend working on this. Here is my shot setup:
Head: Gigapan Epic Pro
Camera: Cannon T1i
Lens: Cannon EF-S 55-250mm f4-5.6 IS
Focal Length: 214mm
Aperture: f6.3
ISO: 200
I am still learning a lot, and I believe that I do have a significant vignette with that lens at that focal length and aperture. I've done some experimenting with color correction settings and anchors and have a few questions.
1. When creating "Reference Image" anchors, is there a way to remove the anchor?
2. I'm having some difficulty understanding (seeing in my test set) the differences introduced by the various anchor types, can you give a layman's guide to how the different anchors types influence the LDR when attempting to correct vignette problems.
3. Is there a way to tell APG what lens and focal length I used in order to tune the vignette correction for that lens? The information is in the image data, but perhaps I need to configure something?

Again, thanks for your help.

Hi!

1) Right-click resp. on older Mac-mouses ctrl-click and you can remove the "reference" anchor by selecting what you need.
2) select an image which represents the average density and color and de-select others. Then select others ba trying their behavior.
Sometimnes it´s good to select several "reference" anchors. That´s try and error.
3) better compensate vignetting in Lightroom, C1, Bibble, DXOP or others before stitching them.

I suggest to check the lens-shade in terms of vignetting.

I also suggest to check the internal camera-settings if you´re using jpg instead of RAW.  I definitely suggest using RAW!

best, Klaus

I've got this down to a panorama picture and I am working on it already a few months various adjustments. HDR correction, exif correction, vinneting corection in Lightroom does not help anything and still are on the Panorame stripes It's hopeless, unfortunately APG failed to correct this panorama
This panorama is taken with the  gigapan epic pro, Canon 5D Mark II and Canon 400 mm 5.6 L

ther is a panorama from raw files BEFORE ANY correction




Uploaded with ImageShack.us


I am tryied auto mode hdr mode , color corecions, vinnete corections on lightroom  and crop pictures and results is same bad

Hi
Show us one or two single images from the sky so we can check it for vignetting.
Show us the shooting pattern.

Have you shoot with any automated mode (aperture, exposure time, white balance, ISO) ?
I don't recommend to start with HDR and bracketing for giga panoramas.
I don't recommend to use a 5x zoom lens for giga panoramas. They have a lot of complex vignetting.

I had the same problem: lens vignetting and internal processing of my camera  resulted in a complex "vignetting", i.e. slightly (ca 3%) reduced intensity at the edges and also at the center of the image. 

You could try a flat field correction (aka shading correction). This is often done in astronomy and microscopy. Basically you take an image of a homogeneously white object (ideally a foggy sky, with no structures in the image), with the same camera parameters that you use in your panorama.
Then you divde your vignetted images by the normalized flat field image.
I applied flat field correction on a few panorama that previously suffered from vignetting, and the quality was significantly improved (not perfect but I am quite happy with the result).

I don't know  for sure but I'd expect that Adobe has a solution for this.
 
Alternatively, if you are a little bit experienced with image processing and programming,  you could use ImageJ (in conjunction with the Calculator plus plugin). I wrote a little macro performing the image division with the calculator plus plugin.  Exif  info can be copied from the original image to the processed image with the Exiftool.  Basically its not complicated (it was my first imageJ macro), but I would recommend this only to people experienced in batch scripting.

For those  who are interested here is the code:

//*****************************************************************************************
//Installation (the code below works well for Windows 7):
//Get ImageJ  (I use the 64-bit version), requires Java
//Install the "Calculator Plus" Plugin, in the ImageJ plugin directory
//Install: ExifTool (e.g. somewhere in your programs directory
//Adapt the  exifToolPath and the basepath correctly
//I also had  to increase the available memory for ImageJ (in the ImageJ.cfg) - the standard value might be too low
//copy the code to an ASCII-File  named FlatFieldCorrecton.txt for example and put this into ImageJs "macro" folder
//Run the Macro

//Defines the path to the Image directories
basepath = "I:\\PTGUI_Images\\";

//Opens all of the images within a common directory, will pop up a window and ask to select thefolder containing the tiles

macro "Open All Files" {
DIR=getDirectory("Choose a Directory");
NAMES=getFileList(DIR);


//Create Output directory
output=exec("cmd.exe /c mkdir "+DIR+"devignetted\\");


//Choose and open the Flat Field image
path=File.openDialog("Choose the Flat Field Image");

FlatFieldPath=path;
open(FlatFieldPath);
rename("flatfield.jpg");



for (i=1; i<NAMES.length; i++) {
openpath=DIR+NAMES[i];
open(openpath);
rename("original.jpg");

run("Calculator Plus", "i1=original.jpg  i2=flatfield.jpg operation=[Divide: i2 = (i1/i2) x k1 + k2] k1=255 k2=0 create");
rename("result");

//Saves the result of the division to the "devignetted" folder
outpath=DIR+"devignetted\\"+NAMES[i];
saveAs("Jpeg",outpath);
close();
selectImage("original.jpg");
close();

//restore the EXIF information
exifToolPath=" C:\\Programme\\Exiftool\\exiftool -overwrite_original -tagsfromfile ";
infilename=DIR+NAMES[i];
outfilename=DIR+"devignetted\\"+NAMES[i];
output=exec(exifToolPath+infilename+" "+outfilename);

}
}

//************************************************************************************

mak wrote:

Hi, I have the similar issue with my pano, which I was made with the following setup: Canon 5D (all parameters  on manual mode) , Samyang 14mm f/2.8, Agno's Mrotaror TCS, APP 3.0.5

Hi
Use LDR color correction and try the exposure balance.
When you have then again problems, try to correct vignetting first before stitching.
APG don't correct vignetting at the moment.