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Sunta Bivings
I'm searching best tool to compress images (png and jpeg) via command line.
After googling I found trimage which is good as it compresses both png and jepeg, but compression ratio is very poor in this case.
It will take all files from /assets/temp folder and optimize jpegs and PNG.I followed this question for the png part. The jpeg part I scraped from several sources. Including PicJam and Image Optimizer. The way I use it is by uploading all files from the user to the temp folder, running this method, uploading the files to azure blob storage, and deleting the local files. I downloaded jpegtran here.
You can statically link all the jpeg code into the dll. A C++ dll can be mixed pure native and C++/CLI code. In our C++/CLI projects, typically only the interface source files know about CLI types, all the rest work with with C++ types.
I'm sure that I'm totally late to answer this question, but recently I have faced on lossless jpeg optimization problem and haven't found any suitable C# implementation of jpegtran utility. So, I have decided to implement by myself routines for lossless jpeg size reducing based on C wrapper of modified jpegtran, which you can find here. It comes, that similar realization with use of pure .Net LibJpeg.NET is far more slower than C wrapped solution, so, I haven't included it to the repo. Using of wrapper is quite simple,
I use libjpeg for lossless operations. It contains a command-line tool jpegtran that can do all you want. With the commandline option -copy none all the metadata is stripped, and -optimize does a lossless optimization of the Huffmann compression. You can also convert the images to progressive mode with -progressive, but that might cause compatibility problems (does anyone know more about that?)
ImageOptim is really slick. The command line option posted by the author will populate the GUI and show progress. I used jpegtran for optimizing and converting to progressive, then ImageOptim for further progressive optimizations and for other file types.
You can use jpegoptim which will losslessly optimize jpeg files by default. The --strip-all option strips all extra embedded info. You can also specify a lossy mode with the --max switch which is useful when you have images saved with a very high quality setting, which is not necessary for eg. web content.
9meg is silly big. You can print a nice 5x7 ot decent 8x10 by dropping the pic to 1600x1200 in Photoshop or Paint shop pro and save at the higest setting. I thee go to JPEG optimizer and do a batch reduction. You won't see a hug e diff b/t a 400k and 800k file. ANything that much under 300k wil begin to show.
9meg is silly big. You can print a nice 5x7 ot decent 8x10 by
dropping the pic to 1600x1200 in Photoshop or Paint shop pro and
save at the higest setting. I thee go to JPEG optimizer and do a
batch reduction. You won't see a hug e diff b/t a 400k and 800k
file. ANything that much under 300k wil begin to show.
When saved, the image is divided into blocks of 88 pixels, and each block is optimized independently. Because the lower-right square does not match the grid cell, the optimizer looks for color indexes averaged between black and white (in JPEG, each 88 block is encoded as a sine wave). This explains the fuzz. Many advanced utilities for JPEG optimization have this feature, which is called selective optimization and results in co-efficients of different quality in different image regions and more saved bytes.
YCbCr is similar to the HSV model in the sense that YCbCr and HSV both separate lightness for which human visual system is very sensitive from chroma (HSV should be familiar to most designers). It has three components: hue, saturation and value. The most important one for our purposes here is value, also known as lightness (optimizers tend to compress color channels but keep the value as high as possible because the human is most sensitive to it). Photoshop has a Lab color mode, which helps us better prepare the image for compression using the JPEG optimizer.
Every time you select the image compression quality, be deliberate in your choice of the program you use for optimization. JPEG standards are strict: they only determine how an image is transformed when reduced file size. But the developer decides what exactly the optimizer does.
Jpegtran can be used in conjunction with Thumbor. If the optimizer has been activated, Thumbor will first process your jpeg normally then it will hand the jpeg off to jpegtran for further optimizations before Thumbor returns the final image.
Once activated, no extra url parameters are needed - jpegtran will run on all jpegs automatically. If you have opted to use progressive jpegs via the PROGRESSIVE_JPEG option, jpegtran will also honor and product progressive jpegs.
? JPEG Image file saving: 91%
? PNG Image file saving: 79%
5. JPEG.ioTo convert images of any format into JPEG, you can try JPEG.io. It handles more image types than most online image optimizer tools. To use it, you drag and upload your PNG, GIF, SVG, or even PSD files to their website. First, the tool converts the images into JPEG, and then compresses them before returning the images to you.
? JPEG Image file saving: 92.7%
? PNG Image file saving: 24.5%
9. Dynamic Drive OptimizerAlthough the Dynamic Drive online image optimizer is arguably the least aesthetic tool on this list, it does get the job done. Not only does it get the job done, but it has a really attractive feature that sets it apart from several of the other image optimizers featured here.
? JPEG Image file saving: 93% (at quality level 60) max 97% (at quality level 10)
? PNG Image file saving: 77% (at 64 colors) max 92% (at 4 colors but this is almost unusable)
Final thoughts on the best online image optimizer toolsAccording to our results, Compress Now is the best JPEG compressor with a 99.97% image compression result, while TinyPNG takes the crown for best PNG compressor with 83%. You can view a summary of our results one more time below:
Most cameras default to sRGB color space automatically, so their images need no color space conversion. However, if you have adjusted your camera for Adobe RGB or some other color space, you will need to convert them to sRGB in order to get the most accurate colors for the projector. Similarly, if you shoot raw images, and you have rendered them as Adobe RGB jpegs, convert those to sRGB.
The JPEG optimizer is where you set the JPEG quality. PaintShop Pro sets the compression ratio, which is a method for reducing file sizes. The problem is that more compression and smaller file sizes result in reduced image quality because some of the image information is lost during the compression process.
With Tinify's online optimizer, image conversion and compression are seamlessly combined into one powerful tool. Simply drag and drop your images onto the web interface, and watch as they are effortlessly converted to WebP, PNG, or JPEG. Our integrated features ensure a smooth workflow, delivering optimized images that are ready for your website.
In many cases Progressive JPEG gives better compression ratio in comparison with Baseline JPEG and to get fair results we need to compare the same modes for different software. For example, mozjpeg software is using Progressive mode by default and any comparison with other software should take that into account. Sure, mozjpeg could produce Baseline images as well, but this is not default mode of operation.
Mozjpeg, which is based on fast libjpeg-turbo, doesn't have the performance of libjpeg-turbo, it's much slower, because it's focused on optimization and interface tasks, not on the performance. We can run such a software on different threads/processes on CPU, though the performance is an issue if we need to utilize such a solution for high load services.
This is actually a good indication of what should be done by good JPEG optimizer software. The software should be able to discover maximum JPEG quality factor and corresponding quantization tables which will not add extra distortion to that particular image. And an attempt to compress that image with the 12th grade should be substituted with the 8th grade instead. This is a minimum requirement for a good JPEG optimization software. It should be also able to reach better compression without extra quality losses in many other cases.
Apart from that, for example, mozjpeg software can take quantization table as a parameter and in that case we just can't expect that standard JPEG quality factor will produce the output that we could usually expect, because quantization table could be different from a Standard one. Utilization of custom quantization table changes the standard approach of JPEG compression, so the result will be different.
JPEG format originally wasn't considered to be intermediate format. When photo cameras save images as JPEGs, it's implied that you will be able to do some JPEG processing to get good image quality and quite high compression ratio afterwards. This is actually the reason why cameras offer not very high JPEG compression ratio in order to offer a possibility for future post processing. This is eventually a trade-off between file size and image quality in photo cameras. To get the best possible image quality and excellent color reproduction, you need to store RAW instead of JPEG. If you try to recompress JPEGs from cameras with JPEG optimizer and with conventional JPEG compression software, the difference will not be so significant, as you can see at advertizing.
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