Questions tagged [image]
The image tag has no usage guidance.
55
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Automate Image resize, scale, position for best quality (size)
I have a process where a web user selects a photo for a profile image. User is then presented with a canvas to zoom, rotate and move their image within a square viewport. Once satisfied, the user ...
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How to identify images with similar content?
There's a set of pictures that if you take them literally, they're different. That is, there can be two images of the same thing among them, only in different hue. In addition, among these two, there ...
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Software to obtain high resolution images of a STEP geometry file
When trying to obtain high resolution images of geometry files, the only option seems to take a screenshot of the software in use (Salome, Catia, etc...). Although enough in most circumstances, it ...
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Can an aspect ratio be shortened to one value, best practise
I want to make a program that, for starters, list all image files in a folder and writes a warning if one dimension is (i.e.) double (2x) the other dimension, regardless of "image orientation&...
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Image made of shapes - terminology + software? [closed]
I've often seen images that look like the following example
Q1) is there a term for such an image?
Q2) What common software is used to convert a real photo (e.g. human face) to be composed of such ...
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What does an algorithm which handles mesh-based image morphing look like?
In recent years, the technology of Live2D has become particularly popular and I have been attempting to find any papers or articles which explain what the mathematics for the mesh-based image morphing ...
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102
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60px * 60px circle image appears pixellated when scaled down to 15px * 15px
We have a circle image with dimensions 60 by 60 px. We want to display this image in a smaller size (15 by 15) on a website using HTML / CSS. When we do so, the image looks blurry (ignore the cropped ...
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55
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35 mm equivalent focal length but with a different aspect ratio
I am doing some image processing and am a little bit confused about reporting a 35 mm equivalent focal length. I am working with a 640x360 image which has an aspect ratio of 1.7777. A 35 mm film is 36 ...
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608
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Difference between Gray-Level and Gray-Scale?
What's the difference between the terms Gray-Level & Gray-Scale ?
I think that Gray-Level refers to the matrix of light-intensities of the Black-White digital image itself whilst Gray-Scale refers ...
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348
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How to change a RGB value using a radiance value?
I am new to this awesome community, I am currently writing a ray tracer but I hit a problem...
Let's say I have a surface(material doesn't matter) of colour [1, 0, 0] in RGB, and the radiance reaching ...
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Space efficient storage/compression of multiple scaled values (mip maps)
Because scaling operations are prohibitively expensive in my current rendering stack, I have to pre-render my images in all desired sizes and cache the result on disk. At the moment, I do this by ...
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splitting hue & saturating and leaving value behind
In an HSV model, the Hue is the color model. So when we split the image or remove H, should we get an image without rgb colors?
Similarly, saturation is the gray shade. I read that images become more ...
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141
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Paint pixels on the image around the cursor for painting application
I'm trying to create a simple painting application. And I was wondering about an efficient way to draw pixels on the screen.
I have a pixel struct:
...
- 516
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Get normalized device coordinate of an image pixel
I have an image rendered to the screen, and based on the normalized device coordinates of the cursor I would like to pick the pixel of the image under the cursor.
Say the image has four channels, I ...
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What fast algorithms can generate not-realistic but quite handsome animated landscapes?
I was looking for algorithms that quickly compute quite nice realistic, or not realistic, animated landscapes, in video format ("animated" = the camera moves, or the water is animated, etc.) But all I ...
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Extract object from image and apply it to different image
SHORT BACKGROUND:
I am developing a neural network based model to differentiate benign and malignant ovarian tumors. I am working with transvaginal ultrasound images, some of which contains yellow ...
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basic of image dithering
Is just read about image-dithering ? So I tried to implement that. Here is my result. Can someone verify it?
My code :
...
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How do you add text dynamically to an image and export it?
Apologize for crossposting, but I posted this in Stack Overflow and thought it might be a better post here.
Recently, Spotify released their 2019 Spotify wrapped web application, which is essentially ...
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How RGB images are formed when normalized between 0 and 1
There is a popular technique of normalising images by dividing each pixel with 255 so that it comes in the range of 0 and 1.
But, then how the same colours are formed when we normalize images.
for ...
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216
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How to create static alpha masks of an image
I have an image of following type-
I want to create mask of the following type where the inside area is white and rest of it is black. How to do it?
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Artificially increase the region of interest of an image
I am solving an image segmentation problem. To increase the accuracy of the model, I came across the following preprocessing step-
First, the set of pixels of the exterior border of the ROI is de-
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139
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What image formats support indexed color palettes with more than 256 colors?
I've been reading up on images with indexed color, and while most indexed image formats are limited to 256 colors, there are apparently image formats that support larger palettes.
According to ...
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97
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Mixing HSV Channel
I have a question about the saturation channel.
1.) So far I know, that saturation channel only give intensity to Hue channel, but I do not understand, how saturation channel can be dark and what is ...
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2
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280
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How RGB images are formed
I have a noob level question about RGB images-
Pixels in RGB images are in the range of (0-255), so technically each channel ranges from 0(black) to 1(white), then why we say that each image has a Red,...
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Description of the process involved in displaying digital images
Could someone please provide me with/point me to a description of the process involved in displaying a digital image? Starting from reading the data from a file to displaying the image on the screen.
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445
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Why BMP file format last line of image is first line on file?
I'm studying Microsoft Windows Bitmap File Format, extension BMP.
I'm curious to know why scanlines are stored on file from bottom to up: the last scanline on image is the first line on file and the ...
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39
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Are there some methods of preventing tools like FotoForensics from detecting manipulations?
I am asking this question purely our of curiosity. I do not look for step-by-step tutorial on how to manipulate a photo and making sure that it will be hard to detect it.
I was wondering, because ...
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How does a GLSL Sampler2D read a Vec2 UV coordinate to determine UV range
I am working with an atlas shader that steps through various sprite tiles within a single png atlas page to playback an animation with sampler2D. Looking at the shader code, I would expect to have to ...
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170
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Bitmap-images or SVG
I'd like to create a GUI in my first Unity-game (2D). I want my GUI appear sharp in all resolutions (e.g. 1920x1200 or 3840x2160).
The problem I am facing now is that I don't know if I should save my ...
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What algorithm to reassemble a broken image?
What algorithm can I use to reassemble a broken image?
Is there any technique? algorithm? Can I use graphs? machine learning? computer graphics?
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OpenGL - Fit High/Low Resolution Image/Texture to a particular size Window
Consider a ray tracer written in OpenGL and using GLFW as a window toolkit. There are basically 2 options to display the ray-traced image.
1) Create a RenderBuffer ...
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Is there a general way how to specify the "image compression loss"?
For JPG, i can choose the "quality" from 100 to 0, which means that any pixel information is divided by 1 (quality = 100) or a very high number (quality = 0).
This results in less or more "artifacts", ...
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Difference between Cropping, Scaling, Resizing & Changing Aspect Ration of an Image?
I've got a new task related to image processing in a website. I am too confused in understanding different terms used with sizing of an image. What is the difference between:
Cropping an image
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817
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What is the typical use case for rendering to an image through imageStore?
The typical scenario for using a texture would simply be:
...
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Tanget plane of an image
My problem is about tangent plane. I have an image (m by n). I obtain surface normal vector using machine learning methods. Then i would like to obtain tangent plane for this surface normal.
To ...
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How to make Convolved Diffuse and Specular image in C#
I am trying to take either a HDR panoramic or HDR cubeMap and from that create a Lambert Irradiance environment map and a Cook-Torrence Specular environment map.
I am stuck at the proper ...
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Why isn't the clear color visible on the screen between frames?
I am told that in computer graphics, the screen refreshes in number of times(in this scenario let say that it renders 60 times per second). The screen is cleared and drawn to 60 times per second.
My ...
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How to merge multiple exr into a single multilayer exr?
Are there some tools or softwares to merge multiple exr into a single multilayer exr?
I only find a tool to split a multilayer exr into multiple exr.
And it seems that Blender, Mitsuba, Darktable ...
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can half of a picture be processed and viewed?
Lets say i have a picture. I send it to a server. While sending it to the server half way the upload gets canceled. Now the server has half or some of the picture. Now is there a way in which this ...
user7115
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How can I remove aliasing in an image without introducing blur?
I am trying to reduce aliasing in an image using some filters. I tried the Gaussian variant of filters to remove the said high frequency patterns in the image, but I feel it's a bit too much of a blur....
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LWJGL/OpenGL render textured quad
So this should be easy and simple, but I still can't get it to work. All I need is a small example program that:
Takes in a BufferedImage (TYPE_INT_ARGB)
Renders that BufferedImage on a textured quad
...
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LWJGL/OpenGL get BufferedImage from texture ID
I have got a texture ID and would like to retrieve its data. The data should be stored in a BufferedImage for future use. I am using the LWJGL library in Java, so ...
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How linear interpolation works between mipmaps?
Nearest interpolation between 2 texels means to take the texel whose center is nearest to a given coordinate to draw or, in other words, the texel the coordinate is matching.
Linear interpolation ...
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Explanation of a the transparency of an .EXR file
Simply put, what does the transparency data of an EXR file represent?
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Depth of Field in Path Tracing: What do I do with the secondary ray?
How can I implement Depth of Field in my Path Tracer? I have read this article which explains the theory behind everything & I already have a good understanding of what this effect needs to ...
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How are the colors for each pixel from a Ray Tracer stored in an Image?
I have begun learning how to create a Ray Tracer and 1 thing I am confused about is how the pixel color from a Ray Tracer is stored into an image. Do we use SetPixel...
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Compression-friendly PNG files
How to create PNG files optimized for being compression-friendly? I.e. would it help if image is created (mostly) from 8x8 unicolor blocks?
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How do you sample an analogue image and store it in a true-colour frame buffer? [closed]
I really cannot get my head around on this issue - how does an analogue image is sampled and then stored in a ture-colour frame buffer (e.g. in a camera) and how do you prevent noise when you do so? ...
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Is there a image-format that support an array per pixel?
For a project dealing with deep semantic labeling of images I need a format that supports arrays of arbitrary length for each pixel of the image.
The array is an array of integers.
Which image ...
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