During work or daily picture processing, occasionally the picture looks gray, usually the color is not bright enough, the details are not prominent enough, the overall look of the lack of hierarchy, the main reason is the lack of contrast in the picture. Whether it's life photos taken by mobile phones, or product maps and presentations needed at work, low-contrast JPG and PNG photos and pictures will affect the feeling and professionalism of watching. A few pictures are easy to adjust, but when there are a large number of pictures need to enhance the contrast, a manual operation will have a sense of fatigue of repetitive labor, so is there a way to make hundreds of 10. pictures batch one-time to enhance the contrast method.
This article will introduce to you, from the computer's own methods to professional gadgets, three solutions to quickly improve the contrast ratio, help us to reproduce the luster of pictures that lack vitality in batches, and try it with me!
When to improve the contrast of photos and pictures?
Picture gray becomes clear
the photos taken may not be dark, but the whole picture is covered with a layer of fog, especially when taking photos on cloudy days or when the indoor lights are dark, the pictures will appear to be devoid of spirit. Improving the contrast can make the picture clearer, brighter in bright places, darker in dark places, and the details will become obvious, making the photos more durable.
Enhance picture texture
the original pictures of product pictures and publicity pictures look very plain and not textured enough. Enhancing contrast can make the color of the products more vivid and the outline more obvious, so that the products can attract the attention of users and look more professional and of more quality.
Can't see the old photos and scanned documents
after many paper documents, contracts or old photos are scanned into pictures, scenes with blurred handwriting and gray background will appear. If the contrast ratio is low, the cost is very strong to see clearly, and the printing is not clear. By improving the contrast ratio, the text can become deeper, the background can become lighter, and the content can be easier to read.
Preview of the effect of batch enhancement of JPG picture contrast
before treatment:
after treatment:
method 1: Use HeSoft Doc Batch Tool Batch Enhance the Contrast of JPG and PNG Images
recommended Index:★★★★★
Advantages:
- specially designed for batch processing, it supports hundreds or thousands of pictures to enhance contrast at the same time, and the processing speed is very fast.
- The interface is simple and easy to understand, there is no complicated operation, and small white users can also use it. At the same time, all files are processed locally, there is no upload requirement, and user privacy and security are paid attention.
Disadvantages:
- only software can be installed in the computer.
Operation steps:
1. Open 【 HeSoft Doc Batch Tool ], select [Picture Tools]-[Picture Effect Enhancement]].
2. Select a method to add JPG, PNG and other pictures that need to be enhanced in contrast in [Add File] or [Import File from Folder], or drag the picture file directly below, and then click Next.
3. Enter the interface to set options, open the [Contrast] key, and drag the round ball below to customize and adjust the contrast (the recommended range is smaller, and the effect is very strong). Finally, click Next, then click Browse to select the location to save the new picture.
4. After waiting for the processing to be completed, click on the path to open the folder. All the pictures have successfully improved the contrast.
Method 2: Use Windows Picture Viewer to Modify Picture Contrast
recommended Index:★★★☆ ☆
advantages:
- the system comes with the function, no additional installation of other software.
- The operation is simple and easy to understand, small white users can easily operate.
Disadvantages:
- the function is limited, and the intensity of contrast improvement has a certain upper limit.
- There is no way to do batch processing, only one picture can be opened for editing and adjustment.
Operation steps:
1. Double-click to open the picture that needs to be set contrast, and then click Edit in the upper left corner.
2. Select the adjustment, find the contrast slider, and drag to improve the contrast.
3. Finally, click on the upper right corner to save as a copy.
Method 3: Use Python OpenCV library to batch JPG and PNG images to improve contrast
recommended Index:★★☆ ☆ ☆
advantages:
- thousands of images can be processed in batches, and the process is fully automated.
- The adjusted contrast parameters can be precisely controlled without worrying about the inconsistent picture effect.
Disadvantages:
- the cost of learning is high and requires a knowledge base of programming.
- Not applicable without a development environment installed.
Operation steps:
1. Install the required libraries:
2. Create the Pyhton script enhance_contrast.py:
import cv2
import numpy as np
import OS
def enhance_contrast(image_path, output_path, contrast_factor=1.5):
#Read image
img = cv2.imread(image_path)
#Adjust contrast
enhanced = cv2.convertScaleAbs(img, alpha=contrast_factor, beta=0)
#Save Image
cv2.imwrite(output_path, enhanced)
#Batch processing
input_folder = "./input_images"
output_folder = "./output_images"
Contrast_factor=1.5 # Contrast coefficient, greater than 1 increases contrast
if not OS .path.exists(output_folder):
OS .makedirs(output_folder)
for filename in OS .listdir(input_folder):
if filename.lower().endswith(('.png', '.jpg', '.jpeg')):
input_path = OS .path.join(input_folder, filename)
output_path = OS .path.join(output_folder, filename)
enhance_contrast(input_path, output_path, contrast_factor)
Print (f "Processed: {filename}")
Print (Batch contrast enhancement completed! ")
3. Finally, modify the folder path and contrast system, and then run the script to complete.