Questions tagged [image-manipulation]
The image-manipulation tag has no usage guidance.
40 questions
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Detecting whether a background image is "too light" to display white text over
I am building a mobile client app that gathers info about movies/TV shows from a website and displays it in a pretty format. When the user clicks on a show, they are taken to a page with the thumbnail ...
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3
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275
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What is use of “DPI” of a “image file” while viewing it on a display?
Display devices have their own PPI.Do these devices respect the DPI information of image file? If not, then what is use of"DPI" of image file?
example:
Image file- height: 1200 px width: 900 ...
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Low resolution Image to High resolution
Is it possible to scale a low resolution image to a highier resolution upto the point with minimum effect on quality, sharpness and other notable attributes of an image.
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How to process large image with a minimum time lag
I am trying to create a web UI for image processing, with some operations similar to what a site like fotor.com offers. However, I have problems to achieve a similar performance. For example, lets say ...
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Is loading the same .jpg in different qualities a waste of data?
I'm building a web site and I want to use a big background image. Because of speed considerations, I thought that it would make sense to send a low-res version of the image the user first (for fast ...
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473
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How are dynamic images programmed?
I have two friends that want to create a jewelry store, focused on customized jewels. The core feature is the jewelry designer, based on a jewel model.
Here's an example of the sort of thing I am ...
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137
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Counting lines of text and get color of a specific line in an image
check this picture out before I explain further:
How can I count the amount of lines there are from the yellow line to line #5? OCR sounds like overkill, because I don't really care what the text ...
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Project a piece of image cut by N-vertex shape to a different N-vertex shape
I have an N-vertex shape that I cut out from an image, and I want to project it onto another shape with the same amount of vertices, but different. So, the image will get changed inside the projection....
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Most efficient way of saving images and sending them to client browser
I'm building an app where users list items for sale and they can include up to five photos for each item. I'm using Azure Blob storage for storing the images.
In my app, I'll be displaying these ...
- 556
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936
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Image segmentation - show or hide clusters
I'm trying to make a small program in c#, that will downsample image to specified amount of colors (using K-means). Then, user will be able to hide\show colored areas(clusters) in image. I've ...
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Is there a (systematic) way to convert a recursive program to a version using user stack?
I have an image (an array of 1000 x 1000 pixels) of 1s and 0s. I was asked to do edge detection, so I wrote this program in C to traverse the figure. My idea was to convert every pixel surrounded by ...
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Mid-Large Asp.net MVC project: Storing images on filesystem or via SQL Server FILESTREAM [duplicate]
We have a ASP.NET MVC project with AngularJS and Entity Framework database-first, a news portal already in production for about a year. The project is mainly focused on providing content for users (...
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743
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Is it possible to antialias existing lines, circles, text, etc. of a single color?
I want to manually antialias the output of GDI drawing functions on Windows. Each drawing function is rendered onto its own image and then blitted back (so alpha blending can work, as GDI doesn't do ...
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79
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Feasible to keep work to a minimum for distribution purposes?
I'm faced with image manipulation requirements for a mobile app I wish to develop that I could quite easily (or 'easier', at least) implement in C# or javascript, as it's what I'm most familiar with.
...
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Technique for distorting part of an image to take features from another image?
I have a project of a community website, where people can alter/manipulate photos that they upload, in a particular way. For example, a person could select various contours and control points on ...
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Lazy-initialization vs preprocessing in image-based iOS app
I am making an iOS app which contains museum gallery: user can look through exhibits and then select info about it, etc.
On the exhibit screen I have two ScrollViews that are different, but are being ...
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201
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Use camera to analyze homogeneity
We are working with some screens whose in the production process change their state from a transparent state to a colored state. This colored state is achieved to block light transmittance.
In this ...
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What are the most appropriate algorithms for downscaling images extremely while maintaining recognition?
I want to create a window icon (128x128 at most, the icon in the corner of the window on Windows is 24x24, I believe) from a large image (1024x768 and more). I've tried several algorithms - nearest ...
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Which Computer Vision / Image Processing technique would solve light imbalance in images?
Given a colour image whose light intensity is dim at the edges and bright in the middle, such as [dim bright dim], which computer vision technique would be recommended to correct this imbalance? ...
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How to integrate and Program Avatar customization in HTML(5)? [closed]
I am making a Game in HTML5. In one part of it, I want the users to be able to customize the avatar they get by default.
For sample, let me share a screenshot from Zombie Lane on Facebook (now this ...
user52009
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Help me understand how to index a pixel in an image
I had a look at the code for the implementation of this paper Graph-Based segmentation by Pedro F. Felzenszwalb
But I didn't understand how in the below code that y * width + x is used to build a ...
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11k
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Dataset with coordinates of borders of countries [closed]
I am creating an application that visually displays world regions, e.g. to place markers within an administrative region.
Does a dataset exist with geometrical or geographical (long/lat) descriptions ...
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11k
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What is the current status of software support for JPEG-2000?
The general recommendation to record original scanned images used to be "use TIFF". But programmers need evolution of format for "evolution of software", and I need to evolve my system to change from ...
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What is watershed in the context of image processing?
I am new to image processing using Python. Now I am learning OpenCV and the mahotas module in Python. Many functions in these modules are related to watershed of an image. I don't know what ...
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Extracting color profile information from JPEG files
I'm trying to look up info about reading JPEG's color profile info and to my surprise there's very little open specific how-to information on that regard, but rather lots of general explanation on ...
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Annotate source code with diagrams as comments
I write a lot of (primarily c++ and javascript) code that touches upon computational geometry and graphics and those kinds of topics, so I have found that visual diagrams have been an indispensable ...
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2k
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Resizing an image with a non-integral conversion factor
I'm resizing an image based on a non-integral conversion factor (a bmp image, in fact). I understand how resizing works, just non with a decimal number. For instance, if the factor were 2, I would ...
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2D Image Creator for a video game
I need to make a few images for an arcade video game I'm making in Java. As of right now, I have drawings that animate, but there are two problems.
The drawings are horrible, and as a result, the ...
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Store HighRes photos in Database or as File?
I run a site which has a couple of million photos and gets over 1000 photos uploaded each day. Up to now, we haven't kept the original file that was uploaded to conserve on space. However, we are ...
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Storing images in file system and returning URLs or virtually resizing and returning byte arrays?
I need to create a REST web service to manage user submitted images and displaying them all in a website. There are multiple websites that are going to use this service to manage and display images. ...
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How does image editing software change image contrast?
How does Photoshop or other image editing software change an images contrast? What does contrast mean when we process an image pixel by pixel? Or what does image contrast mean at all?
Here I created ...
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Is CSS resizing of images still a bad idea?
It's always been looked at that using width/height attributes on images which aren't what the original image actual is is a bad idea. It could mean pixalated images or download sizes bigger than ...
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2k
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Image color/grayscale classification
I am trying to classify a set of images into grayscale or color groups. I have been using ImageMagic to do that, comparing the color image to a grayscale version of itself and then using the Peak ...
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386
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Do paint programs also need database?
I was thinking about how would a paint software works. Firstly I thought that it might not use any database but when I started thinking about the undo function I realized that it might be that the ...
user4124
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Which is better : Storing/retrieving images on/from SQL server or in a directory on server
I am working on a project in Asp.net MVC and need to work with images. There is an SQL database with a Product table. Every product in the table will have it's own image. I have two ways to do this :
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What's the best way to learn image processing? [closed]
I'm a senior in college that hasn't done much image processing before (except for some basic image compression on smartphones). I'm starting a research project on machine learning next semester that ...
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What factors should I be looking at to increase performance in image resizing?
I'm setting up a web app in which people will upload images. Once uploaded the images will be watermarked then resized multiple times (Thumbnails, different sizes etc.) and finally uploaded to Amazon ...
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why is it easy to break verification images if they are not distorted to the extent that humans can get them wrong too?
I don't understand why people like to say "Images had to be distorted otherwise they would be easily cracked". I'm talking about those verification images that we had to type to identify that we are ...
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30k
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How to know if two images are the same? [closed]
I have over 10000 images which about 2000 are duplicates in other formats (as in JPEG, PNG, GIF). Both of these numbers are increasing every day. I need to delete those duplicates and for that I must ...
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Best practice- handling images on website
I am porting an old eCommerce site to MVC 3 and would like to take advantage of design improvements. The site currently has product images stored in 3 sizes: thumbnail, medium (for display in a list) ...
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