For 2d image, there are so many format that we use, view and exchange, such as ppm, tiff, png, jpg, svg... and most of these is for saving pixel data. However, almost every 3d format is for modeling which like svg in 2d. I found some format for neuroimaging but didn't find any generic format to save color pixels.
Is there really no such format?
Related
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?
I have read an image using skimage library. Then I diving each and every pixel value of the image by 1000 and then displayed the image. Both the images look exactly the same with no difference in intensity. Why does two images with different pixels values(though they are in proportion) look same?
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 can generate a MATLAB surface object (using h=pcolor(X,Y,C)) and I would like to save just that surface object in an image format (png, tiff, ...) without any visible background.
The surface is elliptical and not rectangular so I want to see just the ellipse, without white background, axes, labels, ticks, frame, menus, etc.
I want to use it as an overlay on Google Earth so the entity may be rectangular, as long as the parts outside the ellipse are transparent.
MATLAB and its user community seem to offer a number of ways to save images but I have not yet found one that saves just the surface object. Any solutions or even suggestions would be appreciated.
You can use export_fig tool from the matlab's FEX (www) to export the figure with a transparent background (not all the image formats are supported).
To get rid of the axes and just plot the surface, you can do
set(gca,'Visible','off')
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?