36

Because you are shooting with the camera pointing down, you have convergent verticals. This can be fixed with the perspective tool in your image editor: In theory, you should fix the perspective before you rotate the image to fix the tilt, but when you do it in that order, your have no good reference to fix the perspective, so straightening the horizon ...


15

Ever notice when you try to take a photo of a building from the ground, when you aim up to get the entire building into frame, the building appears to taper towards the top? That happens because the camera is tilted vertically upwards. When the camera is held level (in both the vertical and horizontal axes), all vertical and horizontal lines parallel to the ...


11

I don't know if it's the easiest but this works pretty well for my needs: $ align_image_stack -a aligned -C *.jpg 'align_image_stack' utility is part of hugin, and under Debian/Ubuntu (and other derivatives probably) you acquire it by installing 'hugin-tools' package. In the command above: '-a aligned' sets prefix of the name of output images to 'aligned' ...


9

It looks like panotools has a Gimp plugin. I haven't used it, but it's there. Outside of GIMP, but still free, you might want to try going down different roads. Hugin - Primarily targetted at panorama stitching, you can use this to align and scale an image stack for HDR or exposure blending or time-lapse videos or... Registax - Aimed at astrophotographers,...


9

Increase the number of control points. The standard is eight (-c 8). Raise this number to 20, 50, 100 or even 500. You will not get a worse result because of that - align_image_stack will just use (much) more time. A good time for a coffee break! Play around with the required correlation between control points. The standard value is --corr=0.9, so if ...


7

Garbage-In, Garbage-Out A big problem with using DSLR photos as "ground truth" for the improvement of cell-phone photos is the assumption that DSLR photos are necessarily better than cell phone photos. It is possible to make a DSLR photo that closely matches a phone photo by closely matching the FOV and DOF. The lenses you will be using have relatively ...


7

A better way to align images is by using the align_image_stack program, which is part of the free of charge Hugin panorama stitcher program. To align images, you can copy the align_image_stack.exe file to some directory where you put your images im1.tif, im2.tif, etc. You then open a command prompt and type the command: align_image_stack -a al -t 0.3 -c 20 ...


6

As others have noted, lines will converge or diverge depending on the angle at which you hold your camera. To fix this in images that have already been captured: Use a perspective correction tool, as xenoid describes. Use remapping software, such as Hugin, that can calculate an image-specific transformation. This is how lens-correction parameters are ...


5

The easiest way is probably to just use Hugin. The command line tool that's actually doing all the work below the Hugin GUI is align_image_stack, and if you install Hugin, you should just be able to type it on the command line directly, but the Hugin GUI is probably easier to use. From the hugin web pages (should work with the current 2013 version of Hugin)...


4

Your lens should be marked as "Normal" in Hugin, and the focal length multiplier of your camera is 1.0. The auto-alignment in Hugin can be frustrating at times. I have found that the wider the field of view the more difficult it is for Hugin to align images. There are also a few different algorithms that you can choose to automatically select and align ...


4

Never seen this online, it takes a LOT of processing power. There is a free one that comes with Hugin tough. It is called align_image_stack.


4

The greatest single improvement you can do is to stabilize your camera mount. That's were the highest amount of variability is likely occurring. You need a solid floor that doesn't shift. You need a much more solid mount than a 'mid-range' tripod. Use a heavy duty video tripod or a permanently installed mount that doesn't shift. You need a solid tripod ...


3

I've never had a reason to do this but to my knowledge there's no automatic way within Photoshop. You would need to just manually refine them as required. However, if you have the entire Adobe Creative Suite subscription than After Effects can make pretty short work of something like this using the Motion Tracker. If you're making an animated timelapse it ...


3

Yes. You can do this quite easily in Hugin, a popular open source Guide tool for panorama creation and other image alignment tasks. You can read about the details in the corresponding page of the manual, but it really just comes down to going to the control points tab and adding them by clicking. (There's no special trick to it; it's part of the program's ...


3

I don't believe there is anything in Gimp to auto align images. You can do it manually by putting the images in layers, setting the top opacity so you can see the underlying image and scaling/rotating one of them. Or you can use a tool like Enfuse


3

I would align the pictures by hand in GIMP before attempting the HDR processing. Just load them all in layers, pick one as a reference then transform the others to match. You may need to translate, rotate and/or scale to achieve the best alignment. If a perfect alignment is not possible, then favor the high-contrast border areas, like where the sky meets the ...


3

Photomatix allows you to select one exposure for specific areas of the frame. It's the best HDR program I've tried. Here's an example, that includes people walking and moving around between exposures:


3

You can not. You could overcome the displacement of the two lenses using either a prism or a mirror so you have the same position and split the beam of light. You now then need to decide how to crop for the two sensors. You could probably need to strip the phone and camera from the lenses and use a lens before the light enters the prism so you avoid ...


3

In Lightroom you can use the Transform tool to correct horizontal and vertical lines. https://helpx.adobe.com/lightroom/help/guided-upright-perspective-correction.html


3

I don't know what the horizon looks like to the naked eye but what's the intent of the photo? As a pleasant landscape, to my eyes, the original looks best. The lighthouse appears vertical with its taper intact and the horizon dips as it would if you were looking down at a horizontal line vanishing behind the observer (sit in a chair near the center of a ...


2

The last major improvement to PhotoMerge that I'm aware of was in CS4, so CS6 is unlikely to be significantly better. There are many other panorama stitching tools available for Macs, but I would suggest that you try Hugin which is free and allows you to manually add control points (which are how the software identifies which parts of different images are ...


2

From what you've said, the margins are never consistent, which implies that the paper handling isn't working quite right -- whether that's due to a guide not being pushed flush against the paper, or a fault with the device is impossible to say with certainty without physical access to the printer. Had it been a systematic error, then you can always measure (...


2

I just did this in Gimp with no additional software. This method will easily and precisely produce the "3 point scale, rotate, translate" that you asked about. If there's other perspective issues though, one of the other methods in the other answers will be required. Both images in their own layer. Select the ruler. Show Layer1/Image1, measure between ...


2

You can use Filter|G'MIC|Layers|Align Layers. You must select Input Layers: All before executing. Take into account that this is a time consuming operation.


2

You could try with Hugin. It's largely intended for aligning shots to make a panorama, so it may or may not be useful depending on your intended final output. If you're wanting to get aligned overlapping images, then you'll want the intermediate TIFFs it produces just before merging. They'll be aligned, warped to the same viewpoint, and cropped to your ...


2

Hugin used to use the lensfun database. But the 2015 version of Hugin's release notes state: Lens database Hugin now has its own camera and lens database, and hugin_lensdb is the maintenance tool. Lens data is automatically added to the database when stitching a project file from hugin. Data can also be manually added to the database from hugin ...


2

This is a built-in feature of Photoshop, and has been for quite some time: say File → Automate → Contact Sheet II. It does exactly this.


2

The open source package, Hugin, can both align images (its primary purpose is to do panorama stitching), and combine stacked images to HDR. It uses the command line utility: align_image_stack (see also: What open source software for auto-alignment of photographs?). So, there are also a number of GUI front ends that can call align_image_stack to align your ...


2

The Hugin panorama stitcher can be used to align pictures. The align_image_stack executable is part of Hugin and can be run as a standalone command line program. To align pictures im1.tif im2.tif, im3.tif,..., you can give the command align_image_stack -a al -C -t 0.3 -c 20 im1.tif im2.tif im2.tif .... which will output the remapped aligned pictures al0000....


1

I have no idea if Photoshop can do what you're asking, but if your actual problem is that you're trying to create an HDR panorama from a set of bracketed sets of images, I'd recommend using a different stitching tool that offers you more control. Both Hugin and PTGui, as well as a number of other dedicated panostitching programs, can take this type of image ...


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