How To Install leptonica on CentOS 8

leptonica is C library for efficient image processing and image analysis operations C library for efficient image processing and image analysis operations

Introduction

In this tutorial we learn how to install leptonica on CentOS 8.

What is `leptonica`

The library supports many operations that are useful on * Document images * Natural images Fundamental image processing and image analysis operations * Rasterop (aka bitblt) * Affine transforms (scaling, translation, rotation, shear) on images of arbitrary pixel depth * Projective and bi-linear transforms * Binary and gray scale morphology, rank order filters, and convolution * Seed-fill and connected components * Image transformations with changes in pixel depth, both at the same scale and with scale change * Pixelwise masking, blending, enhancement, arithmetic ops, etc. leptonica 1.76.0 2.el8 x86_64 1.0 M leptonica-1.76.0-2.el8.src.rpm powertools C library for efficient image processing and image analysis operations https BSD and Leptonica The library supports many operations that are useful on * Document images * Natural images Fundamental image processing and image analysis operations * Rasterop (aka bitblt) * Affine transforms (scaling, translation, rotation, shear) on images of arbitrary pixel depth * Projective and bi-linear transforms * Binary and gray scale morphology, rank order filters, and convolution * Seed-fill and connected components * Image transformations with changes in pixel depth, both at the same scale and with scale change * Pixelwise masking, blending, enhancement, arithmetic ops, etc.

We can use yum or dnf to install leptonica on CentOS 8. In this tutorial we discuss both methods but you only need to choose one of method to install leptonica.

Install leptonica on CentOS 8 Using dnf

Update yum database with dnf using the following command.

sudo dnf makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install leptonica using dnf by running the following command:

sudo dnf -y install leptonica

Install leptonica on CentOS 8 Using yum

Update yum database with yum using the following command.

sudo yum makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install leptonica using yum by running the following command:

sudo yum -y install leptonica

How To Uninstall leptonica on CentOS 8

To uninstall only the leptonica package we can use the following command:

sudo dnf remove leptonica

leptonica Package Contents on CentOS 8

/usr/lib/.build-id
/usr/lib/.build-id/0b
/usr/lib/.build-id/0b/f4e141be626bb46a45f6d85360bea2862ce48b
/usr/lib64/liblept.so.5
/usr/lib64/liblept.so.5.0.3
/usr/share/doc/leptonica
/usr/share/doc/leptonica/README.html
/usr/share/doc/leptonica/version-notes.html
/usr/share/licenses/leptonica
/usr/share/licenses/leptonica/leptonica-license.txt
/usr/lib/.build-id
/usr/lib/.build-id/74
/usr/lib/.build-id/74/d3620d93ef7b6b1168382c35ae9878a732b88d
/usr/lib/liblept.so.5
/usr/lib/liblept.so.5.0.3
/usr/share/doc/leptonica
/usr/share/doc/leptonica/README.html
/usr/share/doc/leptonica/version-notes.html
/usr/share/licenses/leptonica
/usr/share/licenses/leptonica/leptonica-license.txt

References

[leptonica website](https://github.com/danbloomberg/leptonica https://github.com/danbloomberg/leptonica)

Summary

In this tutorial we learn how to install leptonica on CentOS 8 using yum and dnf.