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Image compression comprise methods with the goal to reduce the size of an image by either removing redundant or less important information (or a combination of the two).

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4answers
3k views

Why does the RAW file format take up so much more space than JPEG?

When I have it set to the highest JPG quality, my 8GB card can hold about 1000 images. If I switch to RAW format, it drops the capacity to about 200 images. So why do images captured as RAW take up 5 ...
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1answer
463 views

Understanding Hue, and is there something else I should be using?

I am trying to isolate objects of a certain color in an image. Looking at this image, you can see that I have extracted the hue channel, and have filtered these values so that the closer a pixel's hue ...
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2answers
494 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 ...
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3answers
2k views

How do I save an image in Tiff format within size range of 10mb to 25mb?

I've an image and after editing it in Photoshop, I have to save it in Tiff format, with the size ranging from 10mb to 25mb. I have to keep the dimensions as 305mm X 203mm at 300dpi. When I don't ...
0
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1answer
423 views

What are compressed image formats with high quality/size ratio?

I'm looking for an image format, unpopular as it may be, that has good quality and also good compression. After I'm done post-processing my RAWs I want to export them in a way that's shareable and ...
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4answers
7k views

How to avoid jpeg compression artefacts when saving photos in web resolution?

When I save a web-resolution image (for example, 1920×1024px), flat areas tints often have damaged shades of color. I'm saving in Photoshop CS4 with quality 2 in standard mode, because I need the ...
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2answers
1k views

What kind of artifacts will Nikon's lossy NEF compression algorithm cause?

The D7000 has two options for NEF compression: "Compressed" and "Lossless compressed" -- the manual says NEF images are compressed using a non-reversible algorithm, reducing file size by about ...