I need to include many images of unknown origin in a report. I have no idea what the images might be: portrait or landscape fotos, large or small, or even something with an atypical shape, like a 400x80 logo.
I'd like to scale down images with the following rule: proportionally downscale until the larger side is 200. And resulting image shouldn't take more space than needed (i.e. 1000x600 should be downscaled to 200x120, not to 200x200), so that there are no unneeded blank margins around non-square images.
Is what I need possible with JasperReports?
EDIT:
To clarify: "real size" mode is almost what I need. However, I don't see a way to limit height of resulting image. As a result, if the image I want to print is a portrait foto (or has even larger height compared to width), generated PDF looks ugly; in this case I would prefer to somehow downscale it to a smaller width.
I solved the Problem of resizing images of various sizes to a fixed size with "RetainShape" by writing an ImageResizer, based on the idea of the ImageTransformer from https://stackoverflow.com/a/39320863/8957103 , using https://github.com/rkalla/imgscalr for scaling the image.
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If you have a file which include objects for example for EE like transistors, resistors etc and if you group them into one and then from the corner drag it to zoom in a bigger figure.
How can I make sure that these components are not zoom in only wiring changes?
The problem is that I have like 30 images with different sizes and I'm placing them in a table with many images side by side. However, if I keep the same scale then some images looks small compared to other. So I tried to scale them to get the same size. However, this make the components's sizes are also scaled up with different scale factors.
Here is an example of circuit using the bult-in shapes in Visio. As you can see the components'sizes got bigger when I scaled up the object. This is usually desired. However, in my specific case I want to keep the component's size same.
Here is the Visio file or I think you can also use any available components in Visio.
https://file.io/VRUCR8yVgYxs
Given any screen resolution, is there a way that I can figure out the amount of points in an inch? For instance, if I wanted to create an NSView that was 8.5 inches by 11 inches (like a sheet of a paper), is there an algorithm that will allow me to obtain the correct point values for the frame across many different types of Macs and screen resolutions?
It's not straightforward. I'm not sure there's a good way. I can provide an approach, but I haven't confirmed that this works reliably:
First, you can use CGDisplayScreenSize() to get the screen's physical size in millimeters. You can obtain the CGDirectDisplayID for a screen from NSScreen, which you can, in turn, get from the window. Obtain the screen's deviceDescription and get the value for the "NSScreenNumber" key. That may need to be cast to CGDirectDisplayID.
The problem from there is that the display mode may not fill the screen. It could be letterboxed or pillarboxed. Or, it might be stretched. This should be fairly uncommon these days, but still possible. You can obtain the display mode using CGDisplayCopyDisplayMode(). To determine if it's stretched, you can examine its ioFlags to see if they contain the bitmask kDisplayModeStretchedFlag (declared in IOKit).
If it's stretched, the screen's frame will have to be mapped to its size in millimeters separately for the X and Y axes. You assume the screen's frame.width (in points) maps to the full physical width, and similarly for the height.
If the mode is not stretched, you'll have to check the aspect ratio of the frame and the screen physical size to see if it's letter- or pillarboxed. If the aspect ratios are very close, then it's presumably not. That case is similar to the stretched case, but the width and height mappings should be equivalent.
If the aspect ratios differ significantly, then you compare them. If the screen's physical aspect ratio is larger than the frame's, then the screen is physically wider than the mode is using (pillarboxed). So, you compute the mapping from points to millimeters from the two heights. If the physical aspect ratio is smaller than the logical one, then the mode is letterboxed and you use the widths to compute the mapping.
I have to resize image i.e if its dimension is 3456x5184 to 700X700 as my code needs image with less number of pixels otherwise it takes too much time to give results.So, when I use imresize command it changes the dimensions of image but at the same time it changes the shape of image i.e the circle in image which I also need to detect looks like oval instead of being cirle. I need your suggestions to resolve this problem. I am really grateful to you people.
Resizing images is done by either subsampling (to get smaller images) or some kind of interpolation (to get larger images)
Input is either a factor or a final dimension for width and height.
The only way to fit a rectangle into a square by simply resizing it is to use different scales for width and height. Which of course will yield in a distorted image.
To achieve what you want you can either crop a 700x700 region from your image or resize image using the same factor for with and height. Then you can fit the larger dimension into 700 and fill the rest around the other dimension with black or whatever you prefer.
Upon using the convert method, I would like to be able to transform a landscape or portrait image given the height and width specify without altering the ratio.
From the documentation, the 'clip' options act as follow:
'clip': Resizes the image to fit within the specified parameters without distorting, cropping, or changing the aspect ratio
If I have a 200x50 image and I want a 150x150 result, this would result in a 150x37px resized image with its ratio identical to the original's.
If I have a 100x50 image and I want a 150x150 result, this would result in a 150x75px resized image with its ratio identical to the original's.
'crop': Resizes the image to fit the specified parameters exactly by removing any parts of the image that don't fit within the
boundaries
If I have a 200x50 image and I want a 150x150 result, this would result in a 150x37px cropped image.
'scale': Resizes the image to fit the specified parameters exactly by scaling the image to the desired size
If I have a 200x50 image and I want a 150x150 result, this would result in a 150x150px resized image where the ratio has been altered to fit.
'max': Resizes the image to fit within the parameters, but as opposed to 'clip' will not scale the image if the image is smaller
than the output size
Same output as in 'clip' except that if I have a 100x50 image and I want a 150x150 result, this would result in a 100x50px resized image with its ratio identical to the original's.
What I would like to have is the ability to make an image conserve its ratio and be of the required dimension (with vertical and horizontal centering if need be). It would result in an image that is not distorted nor clipped.
I understand there are some trickiness to the task as you have to determine what color do you fill the space with (see ImageMagick doc about space filling).
Any insight would be great, hope it is not too much of an edge case.
Take a look at this set of examples in the ImageMagick documentation:
http://www.imagemagick.org/Usage/thumbnails/#square
We don't currently offer the ability to "fill" empty parts of the image with a background color, so do not support this use case. We are looking at adding it in the near term, and will update you when this is added.
Can anybody please tell me what is the exact difference between stretching and scaling an image? Because you can anyway set the size of image and imageView both to match your requirements.
It depends on how you define stretching, but I would divide scaling into two distinct options based on whether or not the aspect ratio is preserved. Often it is desired to preserve the aspect ratio when scaling an image.
I would consider an increase in one dimension, but not proportionally in the other to be a "stretch". Similarly, a decrease in one dimension, but not proportionally in the other would be a "squash".
You may find this Daring Fireball post interesting.
Stretching sounds like showing small size (10x10) image at (100x100) or (100x10). so some times it gets pix-elated.
And scaling means to show a image to different size either small or big with maintaining its aspect ratio (programmetically), so it will look not improper, because when you stretch to different aspect ratio then some objects in image gets improper visibility.
Stretching (in iphone IB) means '9-slice scaling', scaling means just scaling.
When stretching you can determine which part of the image may be used for stretching and which part may not. For example when you have a rounded square, you do not want the roundings to stretch, especially when you're only stretching horizontally or vertically.
You indicate that you only want to use the middle pixel to stretch by (in IB) setting the X & Y values to 0.50 (half way) and the width & height values to 0.00 (minimum amount of pixels)
Lookup contentStretch in the docs for more info
when you don,t keep the congruence of your image, you see the image incongruous and height and width of your image is not suitable for showing. for resolving this issue you can multiply your image's width and height to to a constant coefficient.
Stretching and scaling don't mean anything different except maybe in connotation.
Is there a particular piece of text somewhere that you are trying to understand? Maybe we can help with that.
stretching image is stretching the size of a small image.
on the other hand scaling of image is scaling the image accoring the the viewport's width and viewport's height....
scaling can be done by small as well as large image.
you should take a good quality image and then should scale it
sprite.setscale(x,y);