8
votes
Accepted
Photo quality if you upscale a low-quality photo with Gigapixel AI then downscale back
I think you are expecting far too much from Gigapixel; which is not surprising given the amount of BS in some of their marketing. Many of their marketing examples are just... umm... misleading at best....
- 18.8k
7
votes
Accepted
Should I resize photos before or after image optimization?
The "ImageOptim" tool pulls together a bunch of other things, and in the case of JPEG files, the relevant thing is the MozJPEG optimizing encoder. If you use this encoder and then resize and save with ...
- 143k
6
votes
How to resize images in place in Lightroom
Select the RAW photos, then do an Export.
In the Export Location section, choose Export To: Same folder as original photo.
Check the Add to This Catalog Checkbox.
Select the file output options ...
- 199
5
votes
Accepted
Does JPEG compression reduce actual image size?
Yes, and no :)
I think the article is speaking about the image file size (in bytes), and not the image size itself (in pixels) which is indeed unchanged.
But, to be accurate, one of the tradeoffs of ...
- 21.7k
5
votes
Can I restore an image to original size and dpi after reducing its size?
Depends. If you just resized the image in Word, it probably only changed the display scaling and didn't actually resize the image.
If you did actually resize the image, though, this is an operation ...
- 143k
4
votes
How to scale up an image for print. How large can i go?
Do the math. If you really need 300 DPI, then at most your picture can be (2500 pixels)/(300 pixels/inch) = 8.3 inches wide.
If you want bigger than that you either can't, or you have to relax your ...
- 17.4k
3
votes
Simulating increasing image distance
Short answer: you can't do it with just one image.
Long[er] answer: to realistically simulate distance change, you need either multiple images taken from multiple different subject distances or to ...
- 2,055
2
votes
Accepted
How can I retain apparent detail when downsizing from 4608px to a 150px thumbnail?
There are an enormous number of scaling algorithms, but none of them will do enormously better than the common methods used in applications like PS.
If you want you can try something like ImageMagick ...
- 6,384
2
votes
How can I limit size to a maximum rectangle (rather than just a square) when exporting in DXO OpticsPro?
Let's say you need photo size 30,1 cm (or inch) width and 21 cm (or inch) hight in DxO PhotoLab.
Firstly you need to crop the image to correct aspect ratio.
Select crop tool.
Type to aspect ratio ...
2
votes
How to post process a B/W photo to improve printing
The apparent sharpness of an image can be improved by adding some background noise, texture, or "grain". This can be done digitally or by selecting an output medium such as matte paper or canvas. ...
- 27k
2
votes
How can I upscale a low-res image to make it appear higher-res?
The best techniques for enlargement of a pictorial scene involve vectorization and/or quantization in the frequency spectrum. One successful approach involves converting the image to a series of ...
- 1,999
2
votes
Accepted
How to resize images in place in Lightroom
Another option is to convert to lossy DNG (Library -> Convert Photo to DNG) - you'll have the original resolution image, but with a good space saving relative to a raw file (and there is an option to ...
1
vote
Does JPEG compression reduce actual image size?
I'm going to assume that when you said, "actual image size," you were talking about the number of pixels.
The image you get by decoding a JPEG file always will have the same number of pixels ...
- 635
1
vote
How to transform a picture with reference points on another picture?
It's funny you mention georeferencing. This is something all GIS programs can do quite easily (changing projections, mapping based on points, etc.).
If you don't necessarily have to use Photoshop, ...
- 33
1
vote
Accepted
Tools or methods to extract frame from video which is of higher resolution by combining multiple frames
You're looking for a concept called 'super-res'. There's tools in python to do it, but most is all one-off and custom due to the amount of tuning needed.
Some cameras are main-streaming it though, so ...
- 1,057
1
vote
Can I restore an image to original size and dpi after reducing its size?
Can I get the original size and dpi back (I did not save the original!)
As mattdm mentioned if you only changed the scale of the image then nothing has been lost, yet.
When you export the image be ...
- 1,823
1
vote
Accepted
Simulating increasing image distance
In order to simulate a native resolution image at an appropriate slant range you need to start with an appropriately decimated original and then simulate sharpness loss. If not you will simulate the ...
- 1,999
1
vote
Accepted
At which point do cameras scale photos down when using quarter sensor resolution?
Commonly cameras capture data using the full sensor which gives full-resolution RAW data which is converted into an image and then downscaled. As a matter, if you select to shoot JPEG+RAW, you do ...
- 103k
1
vote
Photoshop and mac not printing correct size?
thanks for your help all.. After hours of mind boggling research I come to the conclusion it could be software.. Corrupted files... Upgraded computer software, uninstalled and re installed photoshop ...
- 21
1
vote
How do I correctly enlarge thermographic images for web use?
Consider using waifu2x, which was originally created to scale manga images using deep convolutional neural networks. It has also been trained to remove JPG compression artifacts and to resize ...
- 27k
1
vote
How can I detect upscaled photos?
I'd take a hybrid approach. I think the other ideas of using a Difference of Gaussians, checking EXIF or other metadata, or even FFT can be combined. Another possibly easier way is to simply take each ...
- 2,893
1
vote
How can I detect upscaled photos?
Actually you can
You don't need a dog to sniff the picture. Go to:
http://rest7.com/image_upscaled
On this page you can upload your image and will get original dimensions, like
this:
...
- 11
Only top scored, non community-wiki answers of a minimum length are eligible