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Image quality describes how well a photograph matches a perceived technical ideal.

learn more… | top users | synonyms (1)

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3answers
4k views

If image I change an image from 72dpi to 300dpi, can I scale it up size without losing quality? [duplicate]

Title says it all. When I change my image from 72dpi to 300dpi, the image gets smaller. Can I scale the image back up and print it out at 300dpi without sacrificing quality?
6
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4answers
2k views

Are there any comparison photos of different lenses (with the same camera and scene)?

I've heard claims ranging from "higher-quality lenses only make a noticeable difference for scientific applications and super-huge prints," to "even the difference between high-quality and ...
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2answers
1k views

Saving as PDF with JPG compression vs saving it as JPG

I am creating a booklet with a hight resolutio (more than 4800 pixels height) and I am about to print it. My question is, what is better in terms of quality: Saving each page as a PDF with JPG ...
2
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1answer
466 views

How to measure the image quality of a DSLR camera [duplicate]

How do we compare the image quality of two cameras? Do we have some tangible parameters to make such an assessment, and what are the main aspects of the image which contribute to image quality? Is ...
5
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2answers
368 views

How does an anti-alias filter affect image quality other than reducing Moire?

The commonly stated trade-off for using an anti-alias filter or not is that it diminishes the risk of moire while also reducing potential sharpness. This is what I have seen myself and in many online ...
6
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1answer
180 views

What characteristics make a digital sensor good?

Generally, the technical image quality of a digital image (before we get to the post-processing stage) is the product of the characteristics of the lens and the recording medium, with an important ...
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4answers
1k views

What does IQ mean?

I see a lot of questions which mention IQ. The only meaning I know outside photography is "intelligence quotient" but obviously IQ has some other meaning here. IQ is used for example in "Lens with ...
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3answers
2k views

Image quality when using the same lens on 16Mpix vs 24Mpix

I'm considering buying a new camera and my two candidates are Nikon D7000 and Nikon D7100. I heard that 24Mpix sensor needs very good lens to produce sharp images. Considering that I currently have ...
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2answers
359 views

Canon a2300 resolution problem

I have Canon Powershot a2300. It was working fine till yesterday but i dnt know what settings have been changed to reduce the size of the image. Previously images sizes were about 4mb now it is kb's ...
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1answer
147 views

Optimal JPGs resolution out of a Point & Shoot camera for storage size and quality? [duplicate]

Simple point & shoots don't produce RAWs, they produce JPGs. Let's assume you have a modern P&S which shoots 16 megapixels maximum in Super Fine, Fine and Normal JPGs. First side question is ...
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4answers
3k views

What image quality is lost when re-saving a JPEG image in MS Paint?

Has anyone ever noticed that if you open a image in mspaint (.jpg, .jpeg) and then just save it, the image size is reduced by many folds. I use this method to reduce the file size. However, I am not ...
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3answers
3k views

Should I use “Super Fine” or “Fine Quality” setting on Samsung S1050 camera? [duplicate]

I have a Samsung S1050 camera. There are three quality settings - Super Fine, Fine and Normal, which I believe relates to the JPEG compression level. I have mainly used Fine in the past, but wonder ...
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3answers
310 views

Would you use an online RAW image processing application? [closed]

I'm just curious, if there was a web-site/web-portal related to RAW image processing what features you would prefer to use on it: RAW image processing (from different Cameras) Implementing different ...
7
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2answers
228 views

What does it mean to excite aliases?

I recently came across the phrase 'excited aliases.' The phrase seems to be related to lens sharpness in some way. While a web search turns up the phrase a few times, I am unable to locate a decent ...
4
votes
1answer
701 views

How to show Sony NEX F3 image quality is better than Nikon 1 J1?

According to this site, Sony NEX F3's sensor is 3x as large as Nikons, and it's image quality is 73 vs Nikon's 56 (how on earth do you come up with a number for this?). I have been experimenting with ...
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1answer
132 views

Is the size of the rear opening of a lens related to image quality?

I purchased a Sony NEX F3, and it came with a 16mm lens and a 18-55mm lens. It seems to me that the 18-55mm lens produces better picture. Does the bigger lens opening in the 18-55mm lens produce ...
3
votes
2answers
555 views

Is there a set of common criteria for evaluation of photographs?

Is there any set of criteria for evaluating a single picture that is in common use? I have the following situation: I want to write down my criteria on how I rate my pictures. At the moment I give ...
5
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2answers
787 views

Is this the level of sharpness and detail I can expect from a Nikon D7000 and 18-105mm lens?

Being a newbie, I would like to have some comments on my current skill level and quality of my current equipment. I own a Nikon D7000 with 18-105. I am not very much satisfied with the quality of ...
5
votes
6answers
19k views

How to reduce file size without losing quality or resolution?

I have 2,300+ pictures that I want to transfer to my phone but on their original size they take up a lot of space (6.44gb) I would like to trim is down to without sacrificing quality or resolution. I ...
2
votes
2answers
120 views

Which is the factor that creates noise in a photo? [duplicate]

Possible Duplicate: What is noise in a digital photograph? This happens while talking photos on dark or night. The Black color is not black, it has some noise. What would be the reason for ...
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2answers
1k views

Why isn't color from my Canon 550D up to my expectations?

I am using a Canon 550D and I am not satisfied with the image quality that it offers. By image quality I am specifically concerned with a general feeling of better color. I have used different lenses ...
3
votes
1answer
524 views

Noisy images from Canon PowerShot SX150 IS

I purchased "Canon PowerShot SX150 IS Point & Shoot 12x" around 9-10 months ago. I was satisfied with image quality. But from last 3-4 months, it is not able to snap good quality pictures as it ...
3
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2answers
5k views

Reasonable file size for printing high quality photography as A3 posters?

I bought some photos and need to send them off for printing. The printing company asked for the final files to be in PDF format, so I've converted them using Illustrator and Photoshop. I also added a ...
7
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3answers
1k views

Why are macros from my new DSLR no better than those from my P&S?

I have been using a 14mp point and shoot for a couple of years. I like to take macros of flowers, frost and bugs. I want to keep zooming in on my PC to see deeper into the flower, so I bought a 18mp ...
4
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2answers
711 views

Are cropped images from a full-frame sensor equal quality to full APS-C images despite the lower resolution?

If I put a DX lens on a Nikon D700, it will reduce megapixels to 5.1. I understand that FX pixels are about 2.5 times larger than DX pixels. Would I be correct to assume that, therefore, my FX image ...
5
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2answers
129 views

Favourable characteristics of robotics research camera?

I use Imaging Source CCD firewire digital cameras to capture video streams for use in robotics research. These cameras are reasonably priced and performance is (from my perspective) decent. ...
3
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2answers
322 views

The Lowdown on Image Quality on DSLRs

I have seen sites that use measure DSLR performances with Image QUality (in numbers). So I was thinking, given a D800 and a D7000, with the same lens, the same lighting condition and many other ...
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1answer
74 views

what is meant by area sampling in graphics? [closed]

What is meant by area sampling in graphics ? I know it is an anti aliasing technique.
3
votes
3answers
470 views

Can you tell how effective a camera's high ISO images are from the specs?

My current camera, a Canon 50D has OK image quality at 1600 ISO and its not really very usable above that. I know that all the manufacturers publish an ISO range for their bodies. But just because ...
2
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3answers
2k views

Lens with small scratches on the front element - how do they affect IQ?

I am looking to buy a CANON 28mm 1.8 EF lens. I found an offer, significantly discounted, of a lens with small scratches on the front element. The offer is very tempting. Here is a photo posted by ...
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2answers
273 views

How to reduce the image resolution to increase ppi?

Having an photo of 4000x3000 resolution with 240ppi. Is it possible get a resolution of 400x300 resolution but with higher ppi?If possible how to do that?
7
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2answers
2k views

Canon 50mm f/1.8 vs Canon 28mm f/1.8 (vs Sigma 30mm f/1.4)

I have the nifty-fifty and I am in love with the kinds of images it can produce, particularly when it comes to portraits. I really enjoy the lens, but I have one problem; it is a little bit too tight ...
3
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1answer
359 views

Clearer - Sharper images reducing noise?

I would like to make my images 'sharper' / 'clearer' with more detail and color and was wondering if this if more of a Equipment issue or rather more of processing the images with different ...
2
votes
2answers
284 views

What is meant by Subjective Image Quality (SQF)?

What does the SQF result in the Imatest Documentation mean? I don't understand the graph showing SQF against Picture Height. How should I calculate SQF value for the camera being tested. For example, ...
2
votes
2answers
828 views

Is it possible to combine multiple cameras for improved detail?

I'm a novice to photography and I'm wondering if its possible to combine multiple cameras to get a greater level of precision? I'm thinking that if you capture more light you should be able to ...
11
votes
8answers
2k views

Can a sharp picture with a kit lens plus post processing rival a “pro” lens?

If I am able to take a relatively sharp picture with a kit lens, and boost the vibrance and or saturation during post processing, will that picture be comparable to ones taken from an expensive ...
2
votes
2answers
647 views

Can ultra-high ISO ever yield good results? [duplicate]

Possible Duplicate: Is high ISO useful for photography? My camera can apparently extend to really high ISO's, however I see serious noise over 2,000 ISO at any shutter/apeture combination. ...
23
votes
2answers
2k views

What characteristics make a lens good or bad?

When reading lens reviews on the Internet, I often find subjective statements about the image quality that a lens produces, such as "good contrast" or "sharp". The problem is that I don't think I am ...
7
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1answer
318 views

What causes this bluish tint and other anomalies in this image?

I bought a Tamron CF Macro 28-70mm 3.5-4.5 lens on eBay for $35 AUD plus postage - cheap enough to give it a go and see what it's like. I took a range of photos with my Sony NEX-C3 to get a feel for ...
0
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1answer
572 views

What does pixel count suggest? [duplicate]

Possible Duplicate: Do megapixels matter with modern sensor technology? Mobile phone manufactures now advertise their phones having camera with bigger megapixel count. Does it mean the ...
0
votes
3answers
563 views

Highest quality vs smallest file size for email

I'm intending to create some photographic images for printing. They'll be used to hang on a wall but will be quite large (80 - 100cm square). Obviously I want the quality to be as high as possible, so ...
3
votes
1answer
3k views

Motorola Razr Maxx compression removal

I've recently acquired a Motorola Razr Maxx. I had hoped its camera would be good for those random shots of opportunity, but unfortunately its quality seems crippled by overzealous JPEG compression. ...
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3answers
582 views

Are there software (preferable freeware) that can judge the quality of a photo (jpeg / raw format)?

I was wondering if there are any freeware that is able to judge the quality of a photo (can be a jpeg or raw format) and give a score to it? I kind of sick of comparing photo taken by different ...
4
votes
5answers
797 views

How can I resize more than 2GB of travel photography with no quality compromise?

I have more then two gigabytes of travel photography. Each image takes up than 4 to 5 megabytes. I have to send them to some one. How can I resize all images while retaining high image quality?
2
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7answers
882 views

Why do these images taken at significantly different ISO appear equal in quality?

How come I can't tell the difference in quality of these two photos, even though one is shot at ISO 160, and the other at 1600 ? Note: EXIF data has been stripped from images below by imgur saving ...
6
votes
5answers
658 views

Is there any reason to take 3 RAW/JPG images to get most from HDR?

I'm new to photography and what I've seen so far: ViewNX allow me to change exposure +2/-2 stops in RAW HDR is about larger dynamic range and merging shadow details from overexposed image with ...
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votes
2answers
329 views

Why color and saturation is less on compact than on DSLR?

So basically I compare Nikon d5100 and Canon Powershoot and image contrast is mach lower on second camera. Is it because of compact sensor quality, or it is theoretically impossible to have great ...
0
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3answers
448 views

How to resize an image for web display?

I'm building some websites for a friend of mine, and putting them up on my home webserver. This server is pretty simple and my network connection ain't that good so the images take pretty long to ...
2
votes
2answers
408 views

Good compromise on quality/compression for hi-rez photographs?

My Nikon D90 dumps out photographs that are 4288 x 2848 @ 300 DPI. They're about ~3 MB in size. I'm an amateur in every sense of the word. I don't know what 75% of the camera settings do. I'm ...
3
votes
2answers
1k views

Does using an adapter on lenses affect the quality of the image?

The camera I am thinking buying doesn't have much selection of lenses. Only 7 or 6 lenses, but using an adapter on the camera can widen the lens selections. Does using non native lenses have any side ...