After playing around with the png for a while using all the normal tools, chucked the png to pngcheck for errors
```pngcheck -qv logo.png  File: logo.png (9821 bytes)  chunk IHDR at offset 0x0000c, length 13  400 x 180 image, 32-bit RGB+alpha, non-interlaced  CRC error in chunk IHDR (computed baf57a58, expected b65879b0)  ERRORS DETECTED in logo.png```
Bad CRC found in IHDR so chucked the png at PCRT ( https://github.com/sherlly/PCRT ), fix the errors and restored the correct image height 
```python PCRT.py -i ../../Documents/liveCTF/radarctf19/misc/logo/logo.png -o ../../Documents/liveCTF/radarctf19/misc/logo/newlogo.png
	 ____   ____ ____ _____ 	|  _ \ / ___|  _ \_   _|	| |_) | |   | |_) || |  	|  __/| |___|  _ < | |  	|_|    \____|_| \_\|_|  
	PNG Check & Repair Tool 
Project address: https://github.com/sherlly/PCRTAuthor: sherllyVersion: 1.1 [Finished] Correct PNG header[Detected] Error IHDR CRC found! (offset: 0x1D)chunk crc: B65879B0correct crc: BAF57A58[Notice] Try fixing it? (y or n) [default:y] y[Finished] Successfully fix crc[Finished] IHDR chunk check complete (offset: 0x8)[Finished] Correct IDAT chunk data length (offset: 0xACB length: 1B7A)[Finished] Correct IDAT CRC (offset: 0x264D): 19ABC7EB[Finished] Correct IDAT chunk data length (offset: 0x2651 length: 1B7A)[Finished] Correct IDAT CRC (offset: 0x41D3): 19ABC7EB[Finished] IDAT chunk check complete (offset: 0xACB)[Finished] Correct IEND chunk[Finished] IEND chunk check complete[Finished] PNG check complete[Notice] Show the repaired image? (y or n) [default:n] n```
With the corrected image we get the flag that was hidden further down the canvas
Flag: radar{hidden_p4rt_looks_smart}