I've been reading about the #2x images being only image that are twice as big as regular image, but do we have to change the DPI to make the quality better or we only need an image that is twice as big ? I don't understand why would a twice as big image of the same quality would be better? Thanks alot
Don't worry about DPI it doesn't matter for screens, but to answer your question making an image twice the size with the same quality would have a much higher pixel density than the original, therefore the pixels rendered will be much sharper and well defined.
For example:
Original image: 300px x 300px = 90,000 pixels
Retina image (same quality): 600px x 600px = 360,000 pixels
Now when the browser renders the Retina image, it still renders it in the same 300px by 300px space as the original image. This means that there are 360,000 pixels in this image instead of the 90,000 pixels before. Now there are lots more pixels to render the same image, so the image is going to look more defined.
For screen, DPI doesn't exist. The raw basic you need to understand is pixel count. You can have a 100px x 100px image that's 1 DPI or 100,000,000 DPI, it makes no difference.
If you really want to learn some more, take a look at http://en.wikipedia.org/wiki/Pixel_density
But for screen output, you can just ignore DPI.
Related
I've been trying to fix an issue where the full-width hero images on my Wordpress website appear blurry on some mobile devices, and in the process I've noticed that this seems to be triggered only at smaller sizes.
The images I'm using are 1920 x 1080 pixels.
Between a width of 1920px to 1024px the images look high-quality and unchanged as far as I can tell, but using Firefox's Responsive Design Mode, I've established that the smaller the image renders the more progressively blurrier (i.e. pixellated) it becomes.
If the browser window is resized to a width of 1023px or less, it becomes a little blurry, whereby setting the DPR setting to 2 restores it to the original quality.
If the browser window is resized to a width of 512px or less, the image becomes very blurry, and setting the DPR to 3 restores it to the original quality.
What's going on here? I understand that the images aren't Retina-optimised, but if this was the actual cause, wouldn't the problem be reversed - wouldn't it be the larger image size that would render blurry? Shouldn't the smallest image render at a high DPI considering it's being displayed at a size of 512px and the source image is much less than double (2x) the 1920px source image?
Would really appreciate some help figuring this out as I've been struggling with it for a few days and it's very hard to test against and debug.
A HiDPI image is really just one that's larger than the display size but crushed into a smaller physical space.
For example if your 1x image is 500px x 500px, then a 2x image would be 1000px x 1000px and 3x would be 1500px x 1500px. The HiDPI designation comes in because the device is able to display all those extra pixels in the same physical space as a normal screen.
So imagine a normal screen is 100px per 1 inch. So your 500px image would be 5in x 5in. The HiDPI screen might be 200px per 1 inch of screen so the 1000px image would still take up 5 inches.
Typically smaller images get blury on HiDPI displays because they're trying to "up res" something like a 500px x 500px image to a display size of 1500px x 1500px.
As for the problem you're experiencing, have you verified the issue on a real device not the FF emulator? Real devices are usually much better at that "up res" process and may not produce the same artifacts.
I would like to find out how to present a banner or logo on a responsive design but I can't find a question that is not flagged as bad or likely to be closed. I've tried numerous ways of phrasing the question and none of them are liked. So, I have no idea how to even present this question or even where to begin to look for the answer or how to ask the question. PLEASE, PLEASE give me an idea of how to word this so someone will see my question. I've tried web searches but nothing addresses the issue and I cannot even figure out how to work it.
In case someone sees this, what I am doing is taking a site that was not responsive and had a banner that was 1100 px wide by 110px in height. The trend seems to be to move away from such banners and use logos that are square or round instead or to use text for branding. If I just reduced the size of the banner to 500px wide then the height would proportionally decrease to only 40 or 50px if a percent value was used. That clearly won't look good on a small screen.
Also, if I reduced the image to a more square dimension the image isn't actually resizing by percent values when the CSS background-image style is used instead of an img tag surrounded by div tags. I haven't found a way to control alignment and size using percent values on the background-image property of a container. I could tell my client that we shouldn't use a wide banner in a responsive design but I don't know if that means I am missing an option.
A different image seems to be required on smaller displays using media queries. Can alignment and resizing as percent values be used with the background image CSS style or should different images be served using the img tag?
Lastly, on a high pixel density display tablet or even smartphone serve a large image due to the number of pixels wide being greater than 900px or 1000px? With high-density displays, it seems that even a smartphone could have a width greater than 1000px but that may not look right.
this will size it:
.img-class {
background-image: url('path/myImage.png');
background-size: 200px 200px;
}
first value is width, second value is height, you can also use %, or to scale the whole thing use a single value like for example: background-size: 80%;
A different image seems to be required on smaller displays using media
queries. Can alignment and resizing as percent values be used with the
background image CSS style or should different images be served using
the img tag?
Yes as long as you scale it down and not up, or it blurs out.
Lastly, on a high pixel density display tablet or even smartphone
serve a large image due to the number of pixels wide being greater
than 900px or 1000px? With high-density displays, it seems that even a
smartphone could have a width greater than 1000px but that may not
look right.
Just be sure your images are 'retina ready' and that's all, meaning if you want to place on your website a 200x200 px image, create it 400x400 px instead, then using css you force it to always be 200x200, so it will read a 400x400 and resize it to 200x200 making it not blurred on mobile.
Side note: If you have graphic images and not photographs, i recommend you using svg (vector images) now supported on all browsers, that are scalable so retina ready by default let's say, and way smaller in size.
I am trying to understand why if I have a Webseite working on 1920px width and I have smartphone with 1920px resolution, it will display different?
I found that Answer (URL) but this confused me even more.
An Example for me:
I have a div Header which has a 100% width and this Header contains 10 images, when viewing this on Desktop everthing is fine (Desktop width 1920px) Now I am changing to my smartphone which also has a Resolution from 1920px and some of the are not in the line anymore. So why isn't that possible?
The Answer with DPI is confusing me because:
I have 2 Screens, both of them has the same Resolution. My Android has bigger Pixel than my Desktop, so how is ist possible that they both have the same Resolution than?
If someone could explain me that or refers an article which explains that, I would be so thankful!
Markus
What he's saying is:
The resolution is the same but the PHYSICAL size of each pixel is different.
Let's assume your screen is 100cm long and your smartphone is 10cm long.
If your screen has 1920px, each one is 100/1920= 0.052cm long.
If your smartphone has 19202px too, each one will be 10/1920 = 0.0052cm long
I considered just one dimension to make it easier. As you can see the physical size of pixels is different and so is the result.
Now you might ask yourself "Ok, but how do I fix this?"
Well instead of saying "Make this item 10px long"
you can say
"Make it 1cm long"
We've seen that pixels size can change from one device to another, but physical units don't.
So 10 pixels might be longer or shorter from device to device but 1cm is always 1cm.
I hope i clarified your doubts! :)
Solution for me was simple:
Example:
Galaxy S4 Resolution (Hardware Pixel) : 1920x1680
Pixel Ratio : 3
Galaxy S4 Optical Pixel: 640x340
I can reproduce this issue in both Chrome and Firefox.
This is SVG image in question:
https://www.iconfinder.com/icons/284101/editor_hambuger_list_menu_view_icon#size=512
And this is the minimum code which reproduces the problem:
<img
style="width: 15px; vertical-align: middle;"
src="data:image/svg+xml;base64,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" /> Menu
You can play with it and see it in action at:
http://jsfiddle.net/adamovic/s3dZ2/1/
Anyone has an idea why this Scalable Vector Graphics gets resize where lines becomes unproportional and also any idea how to fix this good?
BTW, in production I'm resizing this image to 1EM, to appear next to text "Menu" but to reproduce this issue it is the simplest way.
UPDATE: Updated example from 11.5px to 15px, reproducing same issue.
In production I'm using width: 1EM; or something like that for responsive design, any idea how to responsive scale this image so that lines are proportional?
Maybe some fix like min-width and max-width could work, but I couldn't make it work ever with some mozilla image specific commands.
At 11.5 pixels in with the height of the image should be 6.3 pixels. Of those, 1.1 pixels should be the height of each black line, and 1.5 pixels the height of each white line. And on top of that the browser resizes the picture to 6 pixels height.
If the image had 1 pixels for each line (both white and black) and the size multiple of 5, it would look great.
Later edit
In the given picture a black line is 16.67% of image size(all lines reprezent 50%) and a white line is 25%. So... for a height of 8 pixels the a black line has a height of 1.3 pixels and a a white line 2 pixels. On paper the smallest image that looks good and unaltered has 2 pixels for black line and 3 for the white line, meaning an image with 12 pixels height.
Basically if one pixel has to share both white and black lines the browser will create a shade of gray that is the average of the two as it can only display one color.
EX: a pixel has to show 0.67 white(#FFFFFF or 255,255,255) and 0.33(#000000 or 0,0,0) black:
0.67*255 + 0.33*0 = 170.85 (aproximatly 171) so the color displayed is (#ABABAB or 171,171,171)
Theoretically, SVG image is infinitely scalable. In practice however, the screen has limited resolutions, so if you scale an SVG too small, it won't look very good due to pixelations.
To avoid this problem, you need to set a minimum size for the icon at the point where it still looks good. High quality small-sized vector iconsets would usually be designed to have in such a way that their major lines lie in a grid of integer proportion for many different sizes, so that they will look crisp on different sizes; some icon designers might also provide a separately-drawn raster icons for low resolutions.
Inferring from the size declaration in the SVG, the icon you linked seems to have been designed for 22x12 or multiples of it.
On small sizes, you probably should also use media-queries so that small icons are scaled in a step-ladder of sizes with sizes that are known to look good rather than strictly depending on the viewport size.
I've read all over the Internet that I should not define fonts (or anything) with absolute pixel height/width/size and instead, use EM ... so that on higher resolution displays, my web site can scale appropriately.
However, what do I use to define IMAGE height/width ... because images won't scale well (they look pixelated)
UPDATE:
To clarify, I'm not referring to page zoom. I'm referring to how to make my web application resolution independent so that it will look correct on higher DPI displays.
I know this question is a bit old, but want to put this out there for anybody who may come along later. When talking about mobile devices which have higher pixel densities, the mobile browsers will zoom the page in by an amount to make it appear as though the web page is not very small. Devices implement this zooming as per the CSS 2.1 specification.
For example, many devices today have a 1.5x pixel density ratio compared to desktop monitors. As a result, the mobile browser will zoom websites by about 150% to compensate for the extra pixels. The new retina display has a 2x pixel density ratio... and as such the browser zooms in websites by about 200%.
Point of the matter - developers should not have to worry about different resolution devices. If you wish for your images to show up clearly on high resolution devices, you will need a higher resolution image. You generally don't have to worry about 1.5x devices as the quality difference is negligible and not worth the effort. However, the new retina display causes some really blurry images, and as a result you should use 2x the image.
So for the following image, you would want to export a 600x400px image in order for the image to show up clearly on the new retina display:
<img src="photo.jpg" style="width:300px; height:200px" />
Font sizes should be set in em (or %) because if the user changes the text size in IE (View > Text Size), text set in px (or have a fixed size somewhere up the inheritance chain) won't be resized. (Other browsers have no problem resizing text set in px.) See How to size text using ems for more on this.
Images with px dimensions are not resized when the user changes text size; images with em dimensions are resized. So if an image's size should be relative to the text size (a rare case), then use em. Otherwise px dimensions is fine.
For page zoom (where the browser makes everything larger or smaller), it doesn't matter if dimensions (text or image) are defined using em or px.
Normally, I use em for most elements and exact pixels for images. Your images will not scale with everything else when the text size is adjusted, so you need to review how the page looks at different text sizes and adapt when required, but I find this a reasonable compromise (versus scaling the images that is).
Using em when resizing the text in IE, it becomes larger than it should when made larger, and smaller than it should when made smaller.
The solution that works in all browsers, is to set a default font-size in percent for the body element:
body {font-size:100%;}
h1 {font-size:2.5em;}
h2 {font-size:1.875em;}
p {font-size:0.875em;}
http://w3schools.com/css/css_font.asp
You can find a perfect example of image styling using px with source code here: http://w3schools.com/css/css_image_gallery.asp. The images scales perfectly with the text increasing or decreasing it.
see the solution of this page
http://nickcowie.com/2005/elastic-images/
HTML
<div class="imageholder">
<img src="/images/tim_underwood_rb2.jpg" class="vertimage43 floatleft">
<img src="/images/joe_smash1v.jpg" class="vertimage43 floatright">
</div>
CSS
.widecolumn .imageholder {
width:51.5em;}
.widecolumn .vertimage43 {
height:32em;
margin:0;
padding:0;
width:24em;}
It's not really possible to make a page resolution-independent when it comes to images.
You can use SVG for images, because vector graphics truly are indepent of DPI, but this won't work well for photos.
You can use high-resolution images and display them at smaller size. This way, when sized up, they look a lot better. On some browsers, the downscaled image won't look too bad.
This is an example page, http://www.cssplay.co.uk/menu/em_images it has high-res images that are sized with ems. On Opera with page zoom, the high res images retain their clarity at higher zoom levels.
For retina devices you can also have a second image twice the size and add #2x to the file name...
so if you have a 200px x 300px image called image.jpg you just put in another one that's 400px x 600px and name it image#2x.jpg and retina devices will display that instead.