I'm totally new to photoshop and I need to do something I don't really know how.
I got a picture with 100 dpi. We want that picture to be printed on a poster. I need to increase that 100 dpi to 300 dpi.
In photoshop, I went to Image/Image size. I uncheked "Resample Image", switched 100 pixel/inches to 300, but the document size has decreased. The thing is that I do not want to change the poster size. Is the "document size" the same as the poster size? If yes, what should I do to conserve the actual size with increasing from 100dpi to 300dpi? Is growing the image size from 3x is the better solution?
Thanks.
Photoshop, for all the power it has, is still a raster image editor at the core. DPI settings are simply a conversion factor. If you want a larger image, you'll have to increase the canvas size, or REDUCE the dpi setting
e.g.
100x100 image # 100dpi = 1" x 1" image
100x100 image # 200dpi = 0.5" x 0.5"
to "increase the size" of the printed images, you need to REDUCE the dpi count, so that
100x100 image # 5dpi = 20" x 20"
Related
I have got an img element in my HTML document, and its width is about 100px.
The outputs when I set the source to images of different widths that I change every time:
17000 px:
2000 px:
500 px:
100 px:
As you can see, the quality of the image reduces even though the img element's width is at a constant 100px. Is there any reason behind this? If so, what are the practises to be followed to ensure the quality isn't bad?
Are you taking these as screenshots? I'm thinking that the image looks less clear because you have a low resolution when you display them. As in, the area you are showing the image in on your monitor is of a lower resolution than the image itself. So, by making the area displayed larger your monitor can more accurately display the image.
Think of it like this: Displaying a 4K wallpaper on a 720p display won't look as good because the monitor has to scale it down.
Slightly related reading to browser image resizing: https://petapixel.com/2009/11/12/why-you-should-never-let-browsers-resize-your-photos/
I have a photo with a size and pixel diemensions as shown below:
I opened and saved it using Matlab, and the size of this photo becomes much smaller, and also a smaller dpi value. But the diemension is still the same.
Then I converted the two to .bmp format, and the bmp images are in the same size! Does the dpi value correlate to image size, or there are other reasons behind?
When an image is described as 7952× 5304 pixels, then the dpi value is of no consequence. It means nothing.
Where the dpi value comes in, is in describing how large the image will be printed.
You can always resize the image to the dimensions you want with imresize.
When I try to do some research on making icons for Windows, and what size/resolution images I should leave in my .ico files before saving, there's too much weird information.
Some say put 16x16, 24x24, 32x32, 48x48 ... and so on in 96 DPI.
This is what irks me, and I feel it doesn't make any sense.
Isn't 1 pixel = 1 pixel?
Why do they insist on mixing DPI into this?
What is always true is that 1 pixel = 1 pixel. What does change is how big that pixel is on various displays that have different screen densities. That is what DPI describes - number of dots (pixels) per inch. But using DPI in context of image size only makes sense when you use it in combination with inches (centimeters). For instance "create image 10x10 inches at 300 DPI" and from that statement you can calculate that image has to be 3000x3000 pixels in size.
As far as Windows is concerned what does count is font scaling setting that can be set from 100% to 200%
So when you are creating your icons make sure that you have at least 1x and 2x dimensions. If the icon has to be 16x16 pix under normal resolution, that means that you would also create 32x32 pix icon. Other commonly used scaling are 125% and 150%, so it would be good idea to provide icon for those sizes too.
You can freely ignore statements like "Make the icon x pixels wide and x pixels high in x DPI" because those people have no clue what they are talking about.
I am using PDFBox library and create a A4 (8.5x11 inches) page size. Now I have images with 2500x3300 size that I want to write on PDF. But pdf size is actually is 612 x 792, how to write 300 DPI images to PDF ?
If I resize image to fit 2500x3300 -> 612x792, it loses quality. There should be some method to write image to pdf whose have 300 DPI.
I am using PDFBox, Please let me know if I missed anything in above explanation
Updated Question:
Let me explain the question in other way I want to provide a customize setting to user to provide the DPI of image with which image will be drawn to PDF. I know PDFBox can write images to PDF but there is no such DPI settings available which I can use to write images to PDF with respect to DPI. Currently I am using PDFBox with is using PDPageContentStream.drawImage(img, , ); but there is no DPI parameter available to write image on PDF. Please tell me method which we can use to draw images to pdf with DPI parameters.
Thanks
If the process does not down sample the image (the number of pixels does not changes), then you are not loosing quality. The resolution may change though if the physical dimensions of the image in the PDF changes but that does not decrease the quality; it just looks smaller or bigger.
If you want the resolution to stay the same, then the physical dimensions of the image in the PDF follows from that:
image width = 2500 / 300 inch = 600 points;
image height = 3300 / 300 inch = 792 points
Your A4:
page width = 8.5 inch = 612 points;
page height = 11 inch = 792 points
That is actually a nice fit.
Add a horizontal translation of 0, 6 or 12 points to horizontally align the image left, center or right.
--- update
You should not consider DPI as a setting when converting a raster image to PDF (or better: when creating a PDF page with an image on it). The DPI follows from the number of pixel rows and columns of the raster image -and- the physical width and height of that image on the PDF page. If you don't touch the image - which I assume because you don't want to loose quality - then you have to choose the physical width and height such that the resultant DPI is as required. DPI = #pixels / inch.
I want to re-size the image for example say 1000 * 1000 to 100 * 100. And I want to display full image after resizing it. Please can anyone help me?
To scale display objects in Corona either use the scale() command or manipulate the xScale and yScale properties:
http://developer.anscamobile.com/node/2452
Note however that the scaling will look best if the image sticks to power of two divisions. That is, 1/2 size, 1/4 size, etc.
For fast animations (eg. the object transitions away over half a second) the exact scaling you describe would look fine, but otherwise I'm wondering why you would want to do that in Corona (as opposed to scaling the image in Photoshop and simply having a smaller image to begin with.)
It'd be best to create an image of a larger size than you'd like to display. This will preserve the quality. For example you have an image with dimensions of 100x100 and you'd like it to display as a 20x20 image. Do the following:
local IMAGE = display.newImageRect("IMAGE.png", 20, 20)