#SAVE A REDUCED SIZE IMAGE HYPERSNAP HOW TO#
#SAVE A REDUCED SIZE IMAGE HYPERSNAP SOFTWARE#

Adobe uses its own algorithms in Photoshop, so there's no direct correlation, but PixelSugar at 90-100% quality will produce a resulting JPEG that's about the same size as a JPEG saved in Photoshop with quality 9-10. A quality setting of 100 in PixelSugar corresponds to the maximum quality setting available using Apple's algorithms on the Mac. PixelSugar uses Apple's compression algorithms to make its JPEGs. The resulting files will almost always be larger than a JPEG, but will preserve the exact pixel data from the information you're editing. TIFF files can also be compressed, but in a way that doesn't discard any image data. If you're concerned about preserving the maximum possible image quality, save in lossless format such at TIFF. 90% in one program might not be the same relative quality as 90% in another).Įven at its maximum setting, JPEG compression will produce some loss of image quality. But even then, there's no guarantee of correlation (i.e.

#SAVE A REDUCED SIZE IMAGE HYPERSNAP SOFTWARE#

Most software offers a quality slider with a range of 0-100.

Adobe Photoshop offers 12 different quality settings for JPEGs. There's no industry standard for what a given quality setting means when saving a JPEG. There's not necessarily a difference in image fidelity between a 17MB JPEG and a 3MB JPEG, if the two files have been produced by different software - one might just use a better algorithm. More detailed images require more data to describe in a way that doesn't look compressed to our eyes, while images with very little detail might end up being compressed to relatively small file sizes, even at the maximum JPEG quality.

As a result, the file sizes produced by a good algorithm should vary significantly, based on how much detail is in an image. Details have a huge influenceĪ good JPEG algorithm will devote less data to describing image areas that have less detail, while an inefficient algorithm might be more indiscriminate. I personally use and highly recommend JPEGMini Lite on the Mac.

Most of the time, this kind of software is able to produce nearly identical-looking images with huge file-size savings.

Incidentally, there's a whole class of software that does nothing except re-compress JPEG images with a more efficient algorithm. Typically, if you open a JPEG from your digital camera, then do nothing but re-save it as a JPEG with maximum quality, you'll see a 25-50% reduction in file size, or even more for an image with low detail. The in-camera JPEG compression of most digital cameras is pretty horrible, and tends to produce larger images than is necessary. Higher quality will preserve more detail in the saved image, but will also produce a larger file on disk. PixelSugar, like most image editors, lets you choose an image 'quality' setting for JPEGs, which controls the tradeoff between file size and visual quality. This means some image information is discarded in order to save on storage space.

When you open the saved JPEG version, it will be slightly different from the original (if you compared the value of every pixel to the original), but to your eyes, it should look nearly identical. Saving that image as a JPEG might produce a file that's only 2 million bytes, as the file has been 'compressed' with some clever techniques that save space. In both cases, compression allows you to store data on disk with less bytes than it actually contains.įor instance, if you have an image that's 3000x2000 pixels, in RGB color mode, with 8 bits per pixel, then the total amount of data in that image is 18 million bytes (or 18 megabytes, abbreviated to 18MB). Lossless compression allows you to recreate the exact data you began with, byte for byte, while lossy compression attempts to get rid of data selectively, in a way that allows you to reconstruct something close enough to the original.

#SAVE A REDUCED SIZE IMAGE HYPERSNAP HOW TO#

What is JPEG? What is compression?Ĭompressing data means figuring out how to squish it so it takes up less space. However, this is a whole, big, hairy topic that we could discuss for hours, so here are some additional thoughts, if you're inclined. The SHORT answer is this: saving at 90%-ish in PixelSugar (the default) will produce a good quality JPEG that's visually indistinguishable from the original, a larger JPEG file size doesn't necessarily mean better quality, and if you are concerned about maximum quality, save as a TIFF. If dimensions are the same, why are file sizes so vastly different? Saved on drive shows 3.7MB for PixelSugar vs 17MB original. When I look at image size in photoshop, the dimensions are the same(4160圆240 pixels).

Save a reduced size image hypersnap