Why do bar code scanners read the white spaces in between the black lines and not the black lines themselves? - Quora
![Wired Barcode Scanner USB Versatile Scanning Hands-free Scan QR Code 1D&2D Code Reader for Supermarkets/Stores (White) - Walmart.com Wired Barcode Scanner USB Versatile Scanning Hands-free Scan QR Code 1D&2D Code Reader for Supermarkets/Stores (White) - Walmart.com](https://i5.walmartimages.com/asr/4b8889df-c3b1-4d7e-8ed2-3313cf147c65_1.2a45cac5aaf212b098affaec3104ea17.jpeg?odnHeight=612&odnWidth=612&odnBg=FFFFFF)
Wired Barcode Scanner USB Versatile Scanning Hands-free Scan QR Code 1D&2D Code Reader for Supermarkets/Stores (White) - Walmart.com
![Symcode 1d 2d Mini Ring Bleutooth Barcode Scanner,wireless 2d Barcode Reader With 16m Storage Space - Scanners - AliExpress Symcode 1d 2d Mini Ring Bleutooth Barcode Scanner,wireless 2d Barcode Reader With 16m Storage Space - Scanners - AliExpress](https://ae01.alicdn.com/kf/HTB1hTVtdv5TBuNjSspmq6yDRVXa8.jpg_Q90.jpg_.webp)
Symcode 1d 2d Mini Ring Bleutooth Barcode Scanner,wireless 2d Barcode Reader With 16m Storage Space - Scanners - AliExpress
![QR Code Scanner Mobile App on Smartphone Screen Isolated on White Glossy Table. Design Concept for Online Shopping, Cashless Payme Stock Illustration - Illustration of price, label: 153939461 QR Code Scanner Mobile App on Smartphone Screen Isolated on White Glossy Table. Design Concept for Online Shopping, Cashless Payme Stock Illustration - Illustration of price, label: 153939461](https://thumbs.dreamstime.com/b/qr-code-scanner-mobile-app-smartphone-screen-isolated-white-glossy-table-design-concept-online-shopping-cashless-payment-153939461.jpg)
QR Code Scanner Mobile App on Smartphone Screen Isolated on White Glossy Table. Design Concept for Online Shopping, Cashless Payme Stock Illustration - Illustration of price, label: 153939461
![QR code scanning glyph icon. Silhouette symbol. 2D code reading app. Matrix barcode scanner. Two-dimensional barcode. Negative space. Vector isolated illustration 6065224 Vector Art at Vecteezy QR code scanning glyph icon. Silhouette symbol. 2D code reading app. Matrix barcode scanner. Two-dimensional barcode. Negative space. Vector isolated illustration 6065224 Vector Art at Vecteezy](https://static.vecteezy.com/system/resources/previews/006/065/224/original/qr-code-scanning-glyph-icon-silhouette-symbol-2d-code-reading-app-matrix-barcode-scanner-two-dimensional-barcode-negative-space-isolated-illustration-vector.jpg)
QR code scanning glyph icon. Silhouette symbol. 2D code reading app. Matrix barcode scanner. Two-dimensional barcode. Negative space. Vector isolated illustration 6065224 Vector Art at Vecteezy
![TIL that a Barcode scanner doesn't actually scan the black lines of a barcode, but instead it scans the white spaces inbetween. : r/todayilearned TIL that a Barcode scanner doesn't actually scan the black lines of a barcode, but instead it scans the white spaces inbetween. : r/todayilearned](https://external-preview.redd.it/LH8f59KdPT3dOpN-h_TopmyLR1RCX0xqxopcIHlR1A4.jpg?auto=webp&s=05f3dcef7785fae721def196b34abb9df32ff102)
TIL that a Barcode scanner doesn't actually scan the black lines of a barcode, but instead it scans the white spaces inbetween. : r/todayilearned
![Traditional barcode glyph icon. Linear code scanning. One dimensional barcode scanner. UPC code. Silhouette symbol. Negative space. Vector isolated illustration 5191928 Vector Art at Vecteezy Traditional barcode glyph icon. Linear code scanning. One dimensional barcode scanner. UPC code. Silhouette symbol. Negative space. Vector isolated illustration 5191928 Vector Art at Vecteezy](https://static.vecteezy.com/system/resources/previews/005/191/928/original/traditional-barcode-glyph-icon-linear-code-scanning-one-dimensional-barcode-scanner-upc-code-silhouette-symbol-negative-space-isolated-illustration-vector.jpg)
Traditional barcode glyph icon. Linear code scanning. One dimensional barcode scanner. UPC code. Silhouette symbol. Negative space. Vector isolated illustration 5191928 Vector Art at Vecteezy
Merchandise Quality Accounting And Control Black Glyph Icons Set On White Space Goods Shelf Life Barcode
![Box label scanning with barcode scanner glyph icon. Parcel bar code identification. Linear bar code handheld reader. Inventory control. Delivery service. Negative space. Vector isolated illustration 5992885 Vector Art at Vecteezy Box label scanning with barcode scanner glyph icon. Parcel bar code identification. Linear bar code handheld reader. Inventory control. Delivery service. Negative space. Vector isolated illustration 5992885 Vector Art at Vecteezy](https://static.vecteezy.com/system/resources/previews/005/992/885/original/box-label-scanning-with-barcode-scanner-glyph-icon-parcel-bar-code-identification-linear-bar-code-handheld-reader-inventory-control-delivery-service-negative-space-isolated-illustration-vector.jpg)
Box label scanning with barcode scanner glyph icon. Parcel bar code identification. Linear bar code handheld reader. Inventory control. Delivery service. Negative space. Vector isolated illustration 5992885 Vector Art at Vecteezy
![Traditional barcode glyph icon. Linear code scanning. One dimensional barcode scanner. UPC code. Silhouette symbol. Negative space. Vector isolated il Stock Vector Image & Art - Alamy Traditional barcode glyph icon. Linear code scanning. One dimensional barcode scanner. UPC code. Silhouette symbol. Negative space. Vector isolated il Stock Vector Image & Art - Alamy](https://c8.alamy.com/comp/2AH3YEF/traditional-barcode-glyph-icon-linear-code-scanning-one-dimensional-barcode-scanner-upc-code-silhouette-symbol-negative-space-vector-isolated-il-2AH3YEF.jpg)