I know that jpg follows the following method when saving images.
DCT transformation
Quantization
Lossless Compression
Usually when rotating an image
Image -> RGB Array
Rotate
RGB Array -> Convert to Image
I don't want to add loss to the image in the process of converting the file to RGB.
Perhaps there is a way to go through the following steps:
Image -> Quantization Array
Rotate
Quantization Array -> Image
Any good way?
Related
I'm trying to find a way to scale down a QR Code into it's original pixel size without losing data.
QR Code Version 1 Contains 21x21 Pixels
but a lot of the generated QR Codes are scaled up to 200x200 or 300x300 pixels.
I'm trying to scale down the 200x200 or 300x300 into 21x21 without data loss.
I tried searching about how to scale down a qrcode but I didn't find any useful information.
Hi i am uisng MITK Workbench 2016.11.0. I want to save image in PNG or JPEG or TIFF using MITK. But there are only 5 options available: NRRD, NIFTI, VTK, VTK LEGACY IMAGE.
Only 2-d images can be saved in classic 2-d image formats such as PNG, BMP, JPEG, or TIFF and only if the pixel format is supported by the image format.
If you seem to have a 2-d image for which the 2-d options are not available, it's most probably a 3-d image with a single slice. A 3-d image can't be saved as 2-d image even with a single slice as important 3-d meta-data like 3-d origin and orientation in 3-d space would be lost.
I need to map Depth Image that I got from Kinect (X-box) to RGB image (taken from kinect). The problem is that the depth image size is different from that of the RGB image. And I want to calibrate these images and get their pixels. How do I calibrate them? I want the exact same size for both of the images. And the object in the depth image should map on the object in the rgb image.
I have original RGB image.
then, I convert it to gray scale.
then, I assign new threhold value into some pixel.
then, I need to convert the gray scale image from step#3 to RGB image.
I am trying on the step#4. Could you help to advise?
Check out rgb2hsv and hsv2rgb in matlab. Then threshold on the value matrix. This makes more sense to me.
Another possibility is to convert to grey scale but keep the original colour image. Then create a mask by thresholding the grey scale image and use that mask to discard the pixels above/below your threshold on the colour matrix.
I am on MAC OSX.
How to convert an gray scaled image to the RGB format.
Can i use the CIFilters for converting? Or any other way
And also i want to reverse the operation. i.e., convert the RGB format to Gray scaled format.
Regards,
Dhanaraj.
You can draw the grayscale image into an RGB-color context and export that image. Of course, the ability to draw a grayscale image into a non-grayscale context means you probably don't need to convert the image in the first place, since it will be done for you on-the-fly.
Core Image requires RGB images as input and produces them as output. I think it will convert a non-RGB image for you, so you could just use some simple filter in its identity configuration, but that's unnecessary.
What are you really trying to do that requires you to convert the image?