A few questions about image resizing.

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BigDaveinNJ

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Many times I will be surfing the web and find a picture I like. I will download it and save it. It is usually in JPG format.

Here is my problem. The image will be, like 800x600 in size. I will use IRFANVIEW to sesize it, choosing the option of HALF-SIZE. It will do this fine.

However... after resizing the picture and saving again as a jpg, the file size will quite often INCREASE. Often to a signifigantly larger file size than it was when the picture was bigger.

Why is that the case. Isn't part of the idea of resizing a photo to make it somewhat of a smaller file size?

Thanks in advance

DAVID
 

buck52

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At the moment I have not reinstalled Irfanview but I believe it has a default save as of about 75 or 80 ... 100 being the biggest file... if you want a smaller file size just decrease/increase the compression to 50 or so

file size is also altered by any adjustments you make i.e. sharpening etc..

buck
 

BigDaveinNJ

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Thanks Buck... Yes, IRFANVIEW does have settings to that effect. However, when I set it to, let's say, 80%, then the image seems to have some flaws in it. Then, to improve the image quality, I do make a few minor adjustments... and, like you said, the file size goes up.

You would think.... that the image could just be saved exactly the quality that it is, just making it smaller in visible size and also a smaller file size... without any quality loss.

I used to believe that if you tried to enlarge an image beyond a certain point, the image would degrade, but I am finding out sometimes even when you go smaller.... there are issues to.

In essence... what I want to do is...

Take an image, let's say 800 x 600, make it 400 by 300 while reducing the file size somewhat without a loss of quality. As I ahve said in here before... I am a novice at this... and I'm sure some of you guys are licking your chops to bust me about this.... lol Hey... I'm a slow learner. <gr>

Thank You

DAVID
 

buck52

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Hi Big Dave

I used to believe that if you tried to enlarge an image beyond a certain point, the image would degrade,
that is correct...

if you take an image that is 800x600 and reduce it by 50% the file size should be smaller without a doubt and the quality should be virtually the same...

how big an image are you starting with?

Not sure how you're going about it though

buck
 

etaf

Wayne
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just tried a file and it resized and filesize smaller
 

buck52

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Howdy etaf

Irfanview uses the same Lanczos for resizing as Photoshop I believe

Big Dave make sure you are using the Lanczos filer when you resize with Irfanview

buck
 
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lanczos is better for making larger. i personnally like b-spline for shrinking but pretty much all will work. also make sure you are saving to a good format. bitmaps are usually bigger. i personally like gif format at about 80% quality. resampling to 50% will most likely shrink the filesize.
 

BigDaveinNJ

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Thanks... for all of your help. I will try some of the suggested programs and will use some of the tips that were reccomended.

Thanks again

DAVID
 

buck52

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iXneonXi said:
someone please try that out before i do. i dont like installing things if its a trial.
Don't like being a Guinea pig I guess...
rather have someone else do it for you... :rolleyes:

buck
 
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