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Questions tagged [image-quality]

113 questions
20
votes
2 answers

Image Quality using Itext

Is possible to generate a PDF document using Itext which contains imgages with a resolution of 150 dpi. (Seems to be that Itext is reducing the quality of images to 72 dpi.) Thanks
Luixv
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17
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3 answers

canvas drawImage quality

Here is a .png image (on the right), and the canvas element which I drew the image on (on the left). Can you notice the quality difference? Canvas renders the image with noticeable quality loss. What can we do? I observed this result on Chrome and…
Halo
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14
votes
2 answers

PChart linear chart image quality

I am using PChart to create linear charts. Everything goes well beside the quality of the actual lines drawn. Of course, antialiasing is not turned off, and even explicitly turned on. Here is an example of the actual image, which looks quite ugly…
Your Common Sense
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10
votes
1 answer

How to detect Hotspots in an image

How to detect a hotspot in an image using opencv? I have tried googling but couldnt get a clue of it. Description: I need to filter good images from a live video stream. In this case I need to just detect the Hotspot in a frame. I need to do this in…
2vision2
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9
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1 answer

What is the default value of `quality` parameter in `imagepng` function (`PHP`)?

I have used imagepng function in PHP to resize pictures. In the current code, I have not specified the quality parameter. imagepng($im_dest, $destfile); But now I want to use it and increase or decrease the quality based on user's demand. To do…
Ormoz
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8
votes
1 answer

SVG element rendering quality

I have a SVG canvas which user can select and resize some elements inside. And I use preserveAspectRatio="xMidYMid meet" attribute value to keep the original aspect ratio. The original image sources are mostly 256x256px size. On Firefox and…
Noldor
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4
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1 answer

Does a scale-transform applied to a CGPath influence the rendering quality?

I have a CGPath (created by UIBezierPath) which I want to scale to whatever size I want by applying a CGAffineTransformScale. Does this influence my drawing quality (when converting to an image) and if not, why?
Christian 'fuzi' Orgler
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4
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1 answer

Improve image quality while using getDrawingCache - android

I am capturing my layout view using getDrawingCache() method and creating image from it. The code works fine and image gets generated, but the problem here is, the generated image quality is very low. I want the resolution of generated image to be…
AndyN
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3
votes
1 answer

Disable auto-scaling of images in JavaScript Canvas

I've made a basic snake game, and I'm trying to improve one minor detail. You see, when I place the apple image [or leaf image because I had an SVG image for that handy], the canvas scales the image and makes it quite big. Here is my…
rando
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3
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2 answers

Why is the image quality so low? (swift)

I didn't like apples image picker so I decided to implement my own. I just finished the stage of getting all the users photos and displaying them in a collection view although I noticed that the difference in image quality is horrible. Here is my…
coder
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3
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1 answer

R circlize chordDiagram how to improve image qualiity

I am attempting to make a chord diagram of a fairly large 18*65 table (not every cell has a value). I have generated the image I want but the quallity of it is nothing like what is shown on the github seen below: I figure maybe the number of cells…
RMM
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3
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3 answers

proper way to handling images in Android? by using Firebase

I have 10,000 full sized images so each image is about 4MB. I want to display images in android app by using firebase storage and database and recyclerview. My question is Case 1. Do I have to save reduced sized images in firebase storage? Case 2.…
wwwrrrxxx
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3
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2 answers

The converted PDF image looks so blurry in UWP

I want to convert a pdf file to an image UI control in UWP using c#, xaml. I've read another way to use the Flip Viewer, but I need each image file of the converted PDF file. so I modified a bit of the existing sample To open a pdf file. And my…
Kay
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3
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2 answers

How to set the size and quality of a picture taken with the android camera?

I wrote this code that takes a picture with the camera then converts it to a jpeg file and uploads it to Parse.com as a ParseFile. The problem is that the picture is really small (153 x 204 px) and really low quality. I need the picture to be at…
drilonrecica
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3
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3 answers

Image quality in Chrome is bad compared to other browsers

For some weeks now image quality has been terrible in chrome. I've checked the flags to make sure nothing has been enabled by accident. I've also reinstalled chrome and cleared the search history. Here is the same image open in chrome(on the left)…
Oscar
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