JPEG Image Compression problem

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Altaf Raza

JPEG Image Compression problem

Post by Altaf Raza »

Hi

While converting JPEG to PNG i'm facing a problem.On converting
JPEG images of sizes (300 to 900 KB) into PNG the nconvert expands its sizes & resolution(3 to 5 MB) & Converting JPEG of Size(more than 3 MB) nconvert compressed its size (in KB).

Is there any option for JPEG(upto 1 MB of size) should remains its original size(i.e. doesnt expands) after conversion into PNG.
thnx
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xnview
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Re: JPEG Image Compression problem

Post by xnview »

Altaf Raza wrote:While converting JPEG to PNG i'm facing a problem.On converting
JPEG images of sizes (300 to 900 KB) into PNG the nconvert expands its sizes & resolution(3 to 5 MB) & Converting JPEG of Size(more than 3 MB) nconvert compressed its size (in KB).

Is there any option for JPEG(upto 1 MB of size) should remains its original size(i.e. doesnt expands) after conversion into PNG.
You can try different level of compression, but jpeg is lossy and png lossless
Pierre.
thomas59310

Re: JPEG Image Compression problem

Post by thomas59310 »

Ok, but How to change compression level with nconvert?
xnview wrote:
Altaf Raza wrote:While converting JPEG to PNG i'm facing a problem.On converting
JPEG images of sizes (300 to 900 KB) into PNG the nconvert expands its sizes & resolution(3 to 5 MB) & Converting JPEG of Size(more than 3 MB) nconvert compressed its size (in KB).

Is there any option for JPEG(upto 1 MB of size) should remains its original size(i.e. doesnt expands) after conversion into PNG.
You can try different level of compression, but jpeg is lossy and png lossless
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xnview
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Posts: 33850
Joined: Mon Oct 13, 2003 7:31 am
Location: France
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Re: JPEG Image Compression problem

Post by xnview »

thomas59310 wrote:Ok, but How to change compression level with nconvert?
-q
Pierre.
p43k

Re: JPEG Image Compression problem

Post by p43k »

xnview wrote:
thomas59310 wrote:Ok, but How to change compression level with nconvert?
-q
thank you.
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