Hot answers tagged image-processing
22
Photoshop + Layers FTW. (yes, you can also use the Gimp, or any other editing software with the same functions.)
Start with your base image, in the case above, I used the jpeg quality 100 image.
create a new layer atop it
paste the second image into that layer
set the layer style to "difference"
create an effect layer atop that
set the effect to threshold
...
22
Exposure fusion is a process that takes multiple images and combines them to create a single image while only keeping the properly exposed elements. In contrast to HDR images, exposure fusion is more basic, gives a more realistic effect, and requires fewer steps.
The exposure fusion(fusion, or EF) process takes each individual pixel and assigns a weight to ...
19
Color Management is a scientific process by which various devices used in an image processing workflow can be used despite differences in their supported color. Every device is only approximating some of the total range of colors humans can see, and this limited range is called its "color gamut". Each device has limitations, but those limitations differ from ...
17
The entire point of raw files is to save the full unprocessed output of the sensor, there are no programs that edit raw files because if you do any editing it's no longer the raw output and you are better off generating a TIFF from the raw and editing that.
A note about resizing - most camera sensors have a pattern of red, green and blue pixels, where each ...
16
You can't resize RAW files per se. You can crop them in a RAW editor like Adobe Camera RAW, and the crop information will be stored in the sidecar XMP file, but the RAW file itself remains the same.
This depends on your editor, but generally when you 'edit' a RAW file you are just storing settings in a 'sidecar' file. When you re-open the RAW file, the ...
15
Check out Fro Knows Photo.
There is a weekly RAW file you can edit and you can post your result on the forums (they are at edit 81 at the time of writing). Jared (the guy behind the site) then selects a handfull RAW edits from the forum and comments on them in a youtube video. As a plus, Jared and/or Adam will give a full tutorial (again youtube video) on ...
14
IP-Slicer perl script can create slices which can stuck together into a ball. You can define the number of slices.
The following command will create 12 slices, where the sphere circumference is 1500 pixels.
sphere-slicer.pl 12 1500 sampleimage.jpg
Sample input:
Output (12 images):
12
There's nothing wrong with your settings. On my monitor the clouds look fine, not blown out and the greens are nice and saturated.
The most likely explanation is that your laptop screen is inferior i.e. it can't display the same range of colours or the same contrast as your desktop. In addition to that it's not calibrated either.
You don't have to buy ...
12
The simple recipe is to convolve with a Laplacian of Gaussian kernel (3x3, with 8 in the middle surrounded by -1 and take the abs(result)) . After this you get some artifacts if it is a jpeg image, and out of focus borders that have a high intensity difference will also "ping". The result you can threshold to detect the strongest edges and remove teh ...
11
You can use any free (as in freedom) RAW processing software. I can recommend:
UFRaw
It is a stand-alone RAW converter. Its interface is different from many other RAW converters, but I find it quite good. It easily integrates with Gimp photo editor.
RawTherapee
It is more like workflow software rather than just a RAW converter. One may consider its ...
11
It's an interesting question. It's certainly possible for software to detect the parts of an image that is in focus, as it's the basis for focus-stacking software like Helicon Focus.
Focus stacking is a technique used by macro photographers. The depth of field in many macro shots is very shallow, so to extend this it's possible to take a set of photos of ...
11
If you can process the RAW files, you'll have a bayer pixel array comprised of RGRGRG and GBGBGB rows (or possibly RGBGRGBG rows.) You could ignore all the R and B pixels, sum up the G pixels, take the square root (since there are twice as many green pixels as there are red or blue), and divide by half the number of G pixels. That should give you the proper ...
11
If you use Photoshop, here's how I'd do it:
Put the two jpegs in the same psd file, in two separate layers. They should overlap exactly, since their dimensions are the same. (which one goes on top doesn't matter).
Set the layer blending mode to "Difference." You'd see a mostly black result. Depends on the quality difference between the two original layers ...
10
LCD displays actually use several different technologies. You can choose TN (cheap, crappy), IPS (expensive, looks great), or VA (in the middle).
If you can afford it, choose IPS. The most important advantage for photographers is that you don't get color shifts depending on viewing angle; IPS displays are also much easier to calibrate well. As a ...
9
I guess there isn't much more I could say other than I own the Apple CinemaDisplay 30" LCD screen, and I am a heavy duty Microsoft/.NET developer. I work entirely in Windows 7 on my custom-build PC (not a Mac), and this screen has been great. I purchased it quite a number of years ago, and it is still running strong.
If I was in the market more recently, I ...
8
Lightroom offers primarily integration and simplicity. This means a highly integrated workflow which takes care of images from import to publication and a feature set designed to cover the most common processing tasks for photographers. In terms of processing features, Lightroom is far less capable than Photoshop and even includes a workflow to process ...
7
The Adobe Camera RAW/Lightroom white balance presets have too much magenta in them (for Nikon cameras, anyway). This can skew the overall color balance, but it can easily be gotten around by creating your own presets that leave the magenta/green balance at zero.
The latest versions of the RAW engine and DNG spec support DNG profiles, which go a long way ...
7
You could probably in most cases reconstruct an image that looks convincing, but you can't recreate what's actually seen from a point between the viewpoints.
Take for example an image that is taken right in front of a wooden fence, where the two viewpoints are each in the middle of a panel so that they both only see the panel. A viewpoint in between would ...
7
HTP will increase noise as it underexposes the image in order to avoid possibly clipping the highlights. Noise reduction will obviously reduce noise, but at the expense of fine details.
All other in camera processing may reveal noise, but not create it. If you are concerned about noise then I would highly recommend shooting Raw and taking full control over ...
7
A few of the free possibilities include:
DCRaw
RAWHide
StepOK raw importer
Scarab Darkroom
Gimp
DC Raw is kind of the godparent of nearly all the other free/open source camera raw converters. It has code to convert data from almost any camera that can produce a raw file -- but only a command-line interface. Most of the others are basically graphical ...
7
From a technical standpoint, "saturation" is the extent of chromaticity for a certain hue...the hue's "colorfulness". Technically speaking, pink would be a less colorful magenta, but roughly the same hue, where as red would be a distinct and colorful hue on its own. You might think of light rose or salmon to be less colorful variations of red.
When it comes ...
7
As others have noted, much of what's going on in this image is about light, but folks seem to be really over-thinking it. It's kind of a habit we photographers get into after learning a few tricks and acquiring (or lusting after) a bit of gear.
The main light for this shot is overhead, and the effect on the subject is relatively soft. Now, it could be that ...
6
I'm not sure what you mean by 'cheap', but Photoshop Elements is under $100 online.
You may also want to check out Canon's website for downloads. They seem to have all the software that would come with a camera available to download.
I think Picture Style Editor should allow you to open the CR2 files, and it seems the full program is available for ...
6
I think it's quite normal -- especially if you are using a high ISO (sensitivity). It is something I experienced on my old D50.
I think that it is actually a sensor artefact caused by heat within the camera, rather than light leaking in somewhere, though that could also contribute.
Note that for long exposures you should cover up the viewfinder to prevent ...
6
It may help to think about post processing in these terms:
When shooting film, you either took the film to the lab, or developed the film yourself. During this "process", you had the opportunity to further tweak the image to produce the desired effect. In the days of film, it may have been the case that you would have made several test prints until you ...
6
For the best results? Absolutely. There are always little things you can do to tell the story you want to tell in a better way. Remove distractions, draw attention to the subject, enhance aesthetic value of hue combinations, adjust contrast or perceived sharpness, change a transition here, shift emphasis, it goes on forever.
Now, let's define best: ...
6
I'm curious why you think Photoshop doesn't meet what you want, when it clearly does match everyone of your requirements:
Fast. How fast is fast? CS5 runs really well for me. This question reminds me of: http://www.youtube.com/watch?v=8r1CZTLk-Gk
RAW: Adobe Camera Raw is updated constantly to support the latest raw formats
HDR: CS5's HDR capability is ...
6
JPEG is lossy, which means it compresses the image (in part) by discarding data. The data it discards is (normally) chosen to minimize the affect on the quality of the image, but it (virtually) always loses at least a little quality -- and depending on the quality level you choose, it can lose quite a bit. For most photographs it should be considered a ...
6
Yes it is and there are several ways to do that.
The easiest which works with any camera (still or video) is to split the video file into a sequence of stills using software like ffmpeg. Then pass the images to an Exposure Fusion software. While it was not it primary intention, Exposure Fusion works really well to blend images which results in lower noise, ...
6
For an image to be a valid measurement tool two criteria must be met:
The objects must be exactly in the same plane.
The plane must be parallel to the plane of the image sensor.
Criteria one is easy to verify, are both objects sitting on a flat surface? Do any of the objects have a significant depth when compared to the distance between the camera and ...
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