Using the Contrast Bar

This setting controls the difference between light and dark areas in an image. Moving the slider on the scroll bar to the right increases the gray shades between light and dark areas. Moving it to the left decreases gray shades between light and dark areas. The default setting is zero (0). The maximum contrast setting is 100, the minimum setting is –100.

Highlight Bar

This setting defines the lightest (whitest) tones in the scanned image. If you broaden the range that includes the highlight points, the pixels within the newly specified range to be remapped allowing you to see more details in a color/gray image.

Moving the slider on the scroll bar to the left increases the brightness. Moving it to the right decreases the brightness. The default setting is 255. The maximum highlight setting is 255; the minimum setting is 1 (white).

Shadow Bar

The Shadow bar defines the darkest tones in the scanned image. Moving the slider on the scroll bar to the left increases the brightness in shadowed areas. Moving it to the right decreases the brightness in shadowed areas. The default setting is zero (0). The maximum shadow setting is 254 (black); the minimum setting is zero (0).

Gamma Bar

The Gamma bar alters the mid-range gray tones in the scanned image. All optical devices, such as monitors and scanners, have some variance in their light sensitivity characteristics. To get a scanned image with good results, VistaScan provides gamma adjustment capabilities so you can compensate for this variance in your scanner.

Moving the slider on the scroll bar to the right increases the brightness of the mid-range gray tones. Moving it to the left decreases the brightness of the mid-range gray tones. The default setting is 1.2.

Reset Button

Click the Reset button to cancel the changes and return the value to the default setting.

Adjusting the Image Tones

The Curve command is another way to make precise adjustments in the highlight, midtones, or shadow levels in your images. Using this feature corrects the gray/color values in an image. You change the values by altering the shape of the curve that represents the brightness pixels.

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UMAX Technologies Astra 4000 manual Adjusting the Image Tones
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Astra 4000 specifications

UMAX Technologies has made significant strides in the technology landscape with its innovative offering, the Astra 4000. This advanced device stands at the intersection of cutting-edge technology and user-centric design, making it a noteworthy contender in the competitive tech market.

One of the standout features of the Astra 4000 is its powerful processing capabilities. Equipped with a high-performance processor, it ensures that users experience seamless multitasking and swift application launches. With its impressive RAM capacity, users can run multiple applications simultaneously without any lag, enhancing productivity and overall user experience.

The Astra 4000 also boasts a high-resolution display that delivers vivid colors and sharp images, making it perfect for both work and entertainment. Whether it's for graphic design, video editing, or simply streaming high-definition content, the display is optimized to provide exceptional clarity and brightness. This focus on visual excellence is complemented by advanced graphics processing, enabling rich visual experiences in gaming and multimedia applications.

In terms of connectivity, the Astra 4000 is designed for the modern user. It supports a variety of connectivity options, including Wi-Fi 6 and Bluetooth 5.0, providing faster internet speeds and improved connection stability. This extensive range of connectivity choices enables seamless communication with other devices and ensures that users can stay connected wherever they are.

Security is another area where the Astra 4000 shines. It incorporates biometric authentication features such as fingerprint scanning and facial recognition, providing users with enhanced security. This level of protection is increasingly necessary in today's digital landscape, where safeguarding personal information is paramount.

Additionally, UMAX Technologies has placed a strong emphasis on energy efficiency with the Astra 4000. The device is engineered to consume less power, thereby extending battery life without compromising performance. This makes it an excellent choice for users who are often on the go and need a reliable device that can last through long workdays or travel.

Lastly, UMAX Technologies provides robust customer support and regular software updates for the Astra 4000, ensuring that users have access to the latest features and enhancements. With its blend of advanced technology, user-centric features, and a strong focus on security and efficiency, the Astra 4000 is poised to redefine the user experience in its category.
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