Excel catalysts image processing, but also to the extreme of the general Excel original picture is inserted into card insertion or uncontrolled compression ratio to be inserted image among Excel, Excel catalyst but insert a picture, a picture size can be adjusted to develop a the insert mode, so that images can be expected to balance file size and pixel size in Excel.
In the picture processing, it can help a great library, to achieve Mito Xiu Xiu is so routine image processing.
Excel catalyst function Cipian corresponding implementation: 11 wave - fast batch insert a picture and protect the aspect ratio unchanged https://www.jianshu.com/p/9a3d9aa7ba7e
Excel catalyst picture approach, uses a library: ImageFactory, which has a very rich image processing functions, is that of a python picture library.
Specific detailed usage can refer to the official website: https://imageprocessor.org/imageprocessor/imagefactory/#example
It has more than desktop version, there are web version, processing performance soon, no memory leaks.
Code calls very elegant simplicity, taken from the official website of the sample code is as follows:
byte[] photoBytes = File.ReadAllBytes(file);
// Format is automatically detected though can be changed.
ISupportedImageFormat format = new JpegFormat { Quality = 70 };
Size size = new Size(150, 0)
using (MemoryStream inStream = new MemoryStream(photoBytes))
{
using (MemoryStream outStream = new MemoryStream())
{
// Initialize the ImageFactory using the overload to preserve EXIF metadata.
using (ImageFactory imageFactory = new ImageFactory(preserveExifData:true))
{
// Load, resize, set the format and quality and save an image.
imageFactory.Load(inStream)
.Resize(size)
.Format(format)
.Save(outStream);
}
// Do something with the stream.
}
}Excel snippet catalyst used is as follows:
The longest side of the image is controlled using the method according to the Exif information AutoRotate rotate the image, and then use the resize Resize method, the final image is too big fear, the compression method by Quality.
Because the upper method requires the use Image objects can not be released in the current method, its return Clone, do not know whether this treatment is reasonable, there is expert advice can see the next.
public static Image GetImageByReduceSize(string filePath)
{
using (ImageFactory imageFactory = new ImageFactory())
{
var img = imageFactory.Load(filePath);
img.AutoRotate();
int picInsertSrcMaxPixed = Properties.Settings.Default.PicInsertSrcMaxPixed;
Size orgSize = img.Image.Size;
if (orgSize.Height > orgSize.Width)
{
if (orgSize.Height > picInsertSrcMaxPixed)
{
img.Resize(new Size(0, picInsertSrcMaxPixed));
}
}
else
{
if (orgSize.Width > picInsertSrcMaxPixed)
{
img.Resize(new Size(picInsertSrcMaxPixed, 0));
}
}
return (Image)img.Quality(70).Image.Clone();
}
}Technical exchange QQ group
QQ group name: Excel catalyst open discussion groups, QQ group number: 788 145 319
About Excel catalyst
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关于Excel催化剂作者
Name: Li Weijian, for many years engaged in data (BI direction) analysis, a learner in the same way.
Served industries: retail category in particular shoes retail industry, electricity providers (Taobao, Lynx, Jingdong, the only product)
Technical route from an ordinary user, through the Excel software to learn, go from the data world, Coban non-IT professionals.
After many difficulties, and finally reach the plains of technical data on the road, learning many knowledge is no longer too difficult, but also formed its own set of data solutions (data collection, data cleaning and processing, multi-dimensional data modeling, data reporting display, etc.).
Specializes in technology areas: Excel and other Office family of software, the secondary development of VBA & VSTO, Sqlserver database technology, business intelligence BI technology Sqlserver of, Powerbi technology, cloud server deployment technologies.
2018 began his career made a major adjustment, from the original full-time job, turned freelance, no fixed income, temporarily on the road ahead is not clear, bitter return to full-time job, for Excel catalyst operations and development must be greatly affected (within the time could not maintain full-time job can not just put the results in a work published in time, the time outside of work is very limited, because he has thirty years of age, family responsibility).
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